Initially only available in English, Wikipedia now existsin more than 300 languages. TheEnglish Wikipedia, with over 6 million articles, remains the largest of the editions, which together comprise more than 64 million articles and attract more than 1.5 billion unique device visits and 13 million edits per month (about 5edits per second on average) as of April 2024[update].[W 1] As of November 2024[update], over 25% of Wikipedia'straffic was from theUnited States, followed byJapan at 6.2%, theUnited Kingdom at 5.6%,Russia at 5.0%,Germany at 4.8%, and the remaining 53.3% split among other countries.[6]
Various collaborative online encyclopedias were attempted before the start of Wikipedia, but with limited success.[17] Wikipedia began as a complementary project for Nupedia, a free online English-language encyclopedia project whose articles were written by experts and reviewed under a formal process.[18] It was founded on March 9, 2000, under the ownership ofBomis, aweb portal company. Its main figures were Bomis CEOJimmy Wales andLarry Sanger, editor-in-chief for Nupedia and later Wikipedia.[1][19] Nupedia was initially licensed under its own NupediaOpen Content License, but before Wikipedia was founded, Nupedia switched to theGNU Free Documentation License at the urging ofRichard Stallman.[W 2] Wales is credited with defining the goal of making a publicly editable encyclopedia,[20][W 3] while Sanger is credited with the strategy of using awiki to reach that goal.[W 4] On January 10, 2001, Sanger proposed on the Nupedia mailing list to create a wiki as a "feeder" project for Nupedia.[W 5]
Launch and rapid growth
Wikipedia was launched on January 15, 2001[18] (referred to asWikipedia Day) as a singleEnglish language edition with the domain namewww.wikipedia.com,[W 6] and was announced by Sanger on the Nupedia mailing list.[20] The name originated from ablend of the wordswiki andencyclopedia.[21][22] Its integral policy of "neutral point-of-view"[W 7] was codified in its first few months. Otherwise, there were initially relatively few rules, and it operated independently of Nupedia.[20] Bomis originally intended for it to be a for-profit business.[23]
Wikipedia gained early contributors from Nupedia,Slashdot postings, and websearch engine indexing. Language editions were created beginning in March 2001, with a total of 161 in use by the end of 2004.[W 8][W 9] Nupedia and Wikipedia coexisted until the former's servers were taken down permanently in 2003, and its text was incorporated into Wikipedia. TheEnglish Wikipedia passed the mark of 2 million articles on September 9, 2007, making it the largest encyclopedia ever assembled, surpassing theYongle Encyclopedia made in China during theMing dynasty in 1408, which had held the record for almost 600 years.[24]
Citing fears of commercial advertising and lack of control, users of theSpanish Wikipedia forked from Wikipedia to createEnciclopedia Libre in February 2002.[W 10] Wales then announced that Wikipedia would not display advertisements, and changed Wikipedia's domain fromwikipedia.com towikipedia.org.[25][W 11]
After an early period of exponential growth,[26] the growth rate of the English Wikipedia in terms of the numbers of new articles and of editors, appears to have peaked around early 2007.[27] The edition reached 3 million articles in August 2009. Around 1,800 articles were added daily to the encyclopedia in 2006; by 2013 that average was roughly 800.[W 12] A team at thePalo Alto Research Center attributed this slowing of growth to "increased coordination and overhead costs, exclusion of newcomers, and resistance to new edits".[26] Others suggest that the growth is flattening naturally because articles that could be called "low-hanging fruit"—topics that clearly merit an article—have already been created and built up extensively.[28][29][30]
In November 2009, a researcher at theRey Juan Carlos University in Madrid, Spain found that the English Wikipedia had lost 49,000 editors during the first three months of 2009; in comparison, it lost only 4,900 editors during the same period in 2008.[31][32]The Wall Street Journal cited the array of rules applied to editing and disputes related to such content among the reasons for this trend.[33] Wales disputed these claims in 2009, denying the decline and questioning the study's methodology.[34] Two years later, in 2011, he acknowledged a slight decline, noting a decrease from "a little more than 36,000 writers" in June 2010 to 35,800 in June 2011. In the same interview, he also claimed the number of editors was "stable and sustainable".[35] A 2013MIT Technology Review article, "The Decline of Wikipedia", questioned this claim, reporting that since 2007 Wikipedia had lost a third of its volunteer editors, and suggesting that those remaining had focused increasingly on minutiae.[36] In July 2012,The Atlantic reported that the number of administrators was also in decline.[37] In the November 25, 2013, issue ofNew York magazine, Katherine Ward stated, "Wikipedia, the sixth-most-used website, is facing an internal crisis."[38] The number of active English Wikipedia editors has since remained steady after a long period of decline.[39][40]
Milestones
Cartogram showing number of articles in each language as of March 2024.[update] Languages with fewer than 1,000,000 articles are represented by one circle. Languages are grouped by region of continent and each region of continent is presented by a separate color.
In January 2007, Wikipedia first became one of the tenmost popular websites in the United States, according toComscore Networks.[41] With 42.9 million unique visitors, it was ranked #9, surpassingThe New York Times (#10) andApple (#11).[41] This marked a significant increase over January 2006, when Wikipedia ranked 33rd, with around 18.3 million unique visitors.[42] In 2014, it received 8 billion page views every month.[W 13] On February 9, 2014,The New York Times reported that Wikipedia had 18 billionpage views and nearly 500 millionunique visitors a month, "according to the ratings firm comScore".[43] As of March 2023[update], it ranked 6th in popularity, according toSimilarweb.[44] Loveland and Reagle argue that, in process, Wikipedia follows a long tradition of historical encyclopedias that have accumulated improvements piecemeal through "stigmergic accumulation".[45][46]
In January 2013,274301 Wikipedia, anasteroid, was named after Wikipedia;[49] in October 2014, Wikipedia was honored with theWikipedia Monument;[50] and, in July 2015, 106 of the 7,473 700-page volumes of Wikipedia became available asPrint Wikipedia.[51] In April 2019, an Israelilunar lander,Beresheet, crash landed on the surface of theMoon carrying a copy of nearly all of the English Wikipedia engraved on thin nickel plates; experts say the plates likely survived the crash.[52][53] In June 2019, scientists reported that all 16 GB of article text from the English Wikipedia had been encoded intosynthetic DNA.[54]
On January 20, 2014, Subodh Varma reporting forThe Economic Times indicated that not only had Wikipedia's growth stalled, it "had lost nearly ten percent of its page views last year. There was a decline of about 2 billion between December 2012 and December 2013. Its most popular versions are leading the slide: page-views of the English Wikipedia declined by twelve percent, those of German version slid by 17 percent and the Japanese version lost 9 percent."[55] Varma added, "While Wikipedia's managers think that this could be due to errors in counting, other experts feel that Google'sKnowledge Graphs project launched last year may be gobbling up Wikipedia users."[55] When contacted on this matter,Clay Shirky, associate professor at New York University and fellow at Harvard'sBerkman Klein Center for Internet & Society said that he suspected much of the page-view decline was due to Knowledge Graphs, stating, "If you can get your question answered from the search page, you don't need to click [any further]."[55] By the end of December 2016, Wikipedia was ranked the fifth most popular website globally.[56] As of January 2023, 55,791 English Wikipedia articles have been cited 92,300 times in scholarly journals,[57] from whichcloud computing was the most cited page.[58]
On January 18, 2023, Wikipedia debuted a new website redesign, called "Vector 2022".[59][60] It featured a redesignedmenu bar, moving thetable of contents to the left as asidebar, and numerous changes in the locations of buttons like the language selection tool.[60][W 15] The update initially received backlash, most notably when editors of theSwahili Wikipedia unanimously voted to revert the changes.[59][61]
Openness
Differences between versions of an article are highlighted.
Unlike traditional encyclopedias, Wikipedia follows theprocrastination principle regarding the security of its content, meaning that it waits until a problem arises to fix it.[62]
Restrictions
Due to Wikipedia's increasing popularity, some editions, including the English version, have introduced editing restrictions for certain cases. For instance, on the English Wikipedia and some other language editions, only registered users may create a new article.[W 16] On the English Wikipedia, among others, particularly controversial, sensitive, or vandalism-prone pages have been protected to varying degrees.[W 17][63] A frequently vandalized article can be "semi-protected" or "extended confirmed protected", meaning that only "autoconfirmed" or "extended confirmed" editors can modify it.[W 17] A particularly contentious article may be locked so that onlyadministrators can make changes.[W 18] A 2021 article in theColumbia Journalism Review identified Wikipedia's page-protection policies as "perhaps the most important" means at its disposal to "regulate its market of ideas".[64]
In certain cases, all editors are allowed to submit modifications, but review is required for some editors, depending on certain conditions. For example, theGerman Wikipedia maintains "stable versions" of articles which have passed certain reviews.[W 19] Following protracted trials and community discussion, the English Wikipedia introduced the "pending changes" system in December 2012.[65] Under this system, new and unregistered users' edits to certain controversial or vandalism-prone articles are reviewed by established users before they are published.[66] However, restrictions on editing may reduce the editor engagement as well as efforts to diversify the editing community.[67]
Review of changes
Wikipedia's editing interface
Although changes are not systematically reviewed, Wikipedia's software provides tools allowing anyone to review changes made by others. Each article's History page links to each revision.[e][68] On most articles, anyone can view the latest changes and undo others' revisions by clicking a link on the article's History page. Registered users may maintain a "watchlist" of articles that interest them so they can be notified of changes.[W 20] "New pages patrol" is a process where newly created articles are checked for obvious problems.[W 21]
In 2003, economics PhD student Andrea Ciffolilli argued that the lowtransaction costs of participating in awiki created a catalyst for collaborative development, and that features such as allowing easy access to past versions of a page favored "creative construction" over "creative destruction".[69]
Any change that deliberately compromises Wikipedia's integrity is considered vandalism. The most common and obvious types of vandalism include additions of obscenities and crude humor; it can also include advertising and other types of spam.[70] Sometimes editors commit vandalism by removing content or entirely blanking a given page. Less common types of vandalism, such as the deliberate addition of plausible but false information, can be more difficult to detect. Vandals can introduce irrelevant formatting, modify page semantics such as the page's title or categorization, manipulate the article's underlying code, or use images disruptively.[W 22]
Obvious vandalism is generally easy to remove from Wikipedia articles; the median time to detect and fix it is a few minutes.[71][72] However, some vandalism takes much longer to detect and repair.[73]
In theSeigenthaler biography incident, an anonymous editor introduced false information into the biography of American political figureJohn Seigenthaler in May 2005, falsely presenting him as a suspect in theassassination of John F. Kennedy.[73] It remained uncorrected for four months.[73] Seigenthaler, the founding editorial director ofUSA Today and founder of the Freedom ForumFirst Amendment Center atVanderbilt University, called Wikipedia co-founder Jimmy Wales and asked whether he had any way of knowing who contributed the misinformation. Wales said he did not, although the perpetrator was eventually traced.[74][75] After the incident, Seigenthaler described Wikipedia as "a flawed and irresponsible research tool".[73] The incident led to policy changes at Wikipedia for tightening up the verifiability of biographical articles of living people.[76]
Wikipedia editors often have disagreements regarding content, which can be discussed on article Talk pages. Disputes may result in repeated competing changes to an article, known as "edit warring".[W 23][77] It is widely seen as a resource-consuming scenario where no useful knowledge is added,[78] and criticized as creating a competitive[79] and conflict-based editing culture associated with traditional masculinegender roles.[80][81] Research has focused on, for example, impoliteness of disputes,[82][83] the influence of rival editing camps,[84][85] the conversational structure,[86] and the shift in conflicts to a focus on sources.[87][88]
Taha Yasseri of theUniversity of Oxford examined editing conflicts and their resolution in a 2013 study.[89][90] Yasseri contended that simple reverts or "undo" operations were not the most significant measure ofcounterproductive work behavior at Wikipedia. He relied instead on "mutually reverting edit pairs", where one editor reverts the edit of another editor who then, in sequence, returns to revert the first editor. The results were tabulated for several language versions of Wikipedia. The English Wikipedia's three largest conflict rates belonged to the articlesGeorge W. Bush,anarchism, andMuhammad.[90] By comparison, for the German Wikipedia, the three largest conflict rates at the time of the study were for the articles coveringCroatia,Scientology, and9/11 conspiracy theories.[90] In 2020, researchers identified other measures of editor behaviors, beyond mutual reverts, to identify editing conflicts across Wikipedia.[91]
Editors also debate thedeletion of articles on Wikipedia, with roughly 500,000 such debates since Wikipedia's inception. Once an article is nominated for deletion, the dispute is typically determined by initial votes (to keep or delete) and by reference to topic-specific notability policies.[92]
Policies and content
"Five pillars of Wikipedia" redirects here. For the Wikipedia policy, seeWikipedia:Five pillars.
Katherine Maher, What Wikipedia Teaches Us About Balancing Truth and Beliefs, 2022,TED talks, 15 minutes
Content in Wikipedia is subject to the laws (in particular,copyright laws) of the United States and of the US state ofVirginia, where the majority of Wikipedia's servers are located.[W 24][W 25] By using the site, one agrees to the Wikimedia FoundationTerms of Use andPrivacy Policy; some of the main rules are that contributors are legally responsible for their edits and contributions, that they should follow the policies that govern each of the independent project editions, and they may not engage in activities, whether legal or illegal, that may be harmful to other users.[W 26][W 27] In addition to the terms, the Foundation has developed policies, described as the "official policies of the Wikimedia Foundation".[W 28]
The fundamental principles of the Wikipedia community are embodied in the "Five pillars", while the detailed editorial principles are expressed in numerous policies and guidelines intended to appropriately shape content.[W 29] The five pillars are:
Wikipedia is an encyclopedia
Wikipedia is written from a neutral point of view
Wikipedia is free content that anyone can use, edit, and distribute
Wikipedia's editors should treat each other with respect and civility
Wikipedia has no firm rules
The rules developed by the community are stored in wiki form, and Wikipedia editors write and revise the website's policies and guidelines in accordance with community consensus.[93] Editors can enforce the rules bydeleting or modifying non-compliant material.[W 30] Originally, rules on the non-English editions of Wikipedia were based on a translation of the rules for the English Wikipedia. They have since diverged to some extent.[W 19]
According to the rules on the English Wikipedia community, each entry in Wikipedia must be about a topic that isencyclopedic and is not a dictionary entry or dictionary-style.[W 31] A topic should also meetWikipedia's standards of "notability", which generally means that the topic must have been covered in mainstream media or major academic journal sources that are independent of the article's subject.[W 32] Further, Wikipedia intends to convey only knowledge that is already established and recognized.[W 33] It must not present original research.[W 34] A claim that is likely to be challenged requires a reference to a reliable source, as do all quotations.[W 31] Among Wikipedia editors, this is often phrased as "verifiability, not truth" to express the idea that the readers, not the encyclopedia, are ultimately responsible for checking the truthfulness of the articles and making their own interpretations.[W 35] This can at times lead to the removal of information which, though valid, is not properly sourced.[94] Finally, Wikipedia must not take sides.[W 36] As Wikipedia policies changed over time, and became more complex, their number has grown. In 2008, there were 44 policy pages and 248 guideline pages; by 2013, scholars counted 383 policy pages and 449 guideline pages.[95]
Wikipedia's initial anarchy integrated democratic andhierarchical elements over time.[96][97] An article is not considered to be owned by its creator or any other editor, nor by the subject of the article.[W 37]
Editors in good standing in the community can request extrauser rights, granting them the technical ability to perform certain special actions. In particular, editors can choose to run for "adminship",[98] which includes the ability to delete pages or prevent them from being changed in cases of severe vandalism or editorial disputes.[W 38] Administrators are not supposed to enjoy any special privilege in decision-making; instead, their powers are mostly limited to making edits that have project-wide effects and thus are disallowed to ordinary editors, and to implement restrictions intended to prevent disruptive editors from making unproductive edits.[W 38]
By 2012, fewer editors were becoming administrators compared to Wikipedia's earlier years, in part because the process of vetting potential administrators had become more rigorous.[99] In 2022, there was a particularly contentious request for adminship over the candidate's anti-Trump views; ultimately, they were granted adminship.[100]
Wikipedia has delegated some administrative functions tobots, such as when granting privileges to human editors. Suchalgorithmic governance has an ease of implementation and scaling, though the automated rejection of edits may have contributed to a downturn in active Wikipedia editors.[95]
Dispute resolution
Over time, Wikipedia has developed a semi-formal dispute resolution process. To determine community consensus, editors can raise issues at appropriate community forums, seek outside input through third opinion requests, or initiate a more general community discussion known as a "request for comment".[W 23]
Wikipedia encourages local resolutions of conflicts, which Jemielniak argues is quite unique in organization studies, though there has been some recent interest inconsensus building in the field.[101]Joseph Reagle andSue Gardner argue that the approaches to consensus building are similar to those used byQuakers.[101]: 62 A difference from Quaker meetings is the absence of afacilitator in the presence of disagreement, a role played by the clerk in Quaker meetings.[101]: 83
The Arbitration Committee presides over the ultimate dispute resolution process. Although disputes usually arise from a disagreement between two opposing views on how an article should read, the Arbitration Committee explicitly refuses to directly rule on the specific view that should be adopted.[102]
Statistical analyses suggest that the English Wikipedia committee ignores the content of disputes and rather focuses on the way disputes are conducted,[103] functioning not so much to resolve disputes and make peace between conflicting editors, but to weed out problematic editors while allowing potentially productive editors back in to participate.[102] Therefore, the committee does not dictate the content of articles, although it sometimes condemns content changes when it deems the new content violates Wikipedia policies (for example, if the new content is considered biased).[f] Commonly used solutions include cautions and probations (used in 63% of cases) and banning editors from articles (43%), subject matters (23%), or Wikipedia (16%).[102] Complete bans from Wikipedia are generally limited to instances ofimpersonation andantisocial behavior.[W 39] When conduct is not impersonation or anti-social, but rather edit warring and other violations of editing policies, solutions tend to be limited to warnings.[102]
Each article and each user of Wikipedia has an associated and dedicated "talk" page. These form the primary communication channel for editors to discuss, coordinate and debate.[104] Wikipedia's community has been described ascultlike,[105] although not always with entirely negative connotations.[106] Its preference for cohesiveness, even if it requires compromise that includes disregard ofcredentials, has been referred to as "anti-elitism".[W 40]
Wikipedia does not require that its editors and contributors provide identification.[107] As Wikipedia grew, "Who writes Wikipedia?" became one of the questions frequently asked there.[108] Jimmy Wales once argued that only "a community ... a dedicated group of a few hundred volunteers" makes the bulk of contributions to Wikipedia and that the project is therefore "much like any traditional organization".[109]
In 2008, aSlate magazine article reported that: "According to researchers in Palo Alto, one percent of Wikipedia users are responsible for about half of the site's edits."[110] This method of evaluating contributions was later disputed byAaron Swartz, who noted that several articles he sampled had large portions of their content (measured by number of characters) contributed by users with low edit counts.[111]
The English Wikipedia has6,966,700 articles,48,852,755 registered editors, and126,491 active editors. An editor is considered active if they have made one or more edits in the past 30 days.[W 41] Editors who fail to comply with Wikipedia cultural rituals, such as signing talk page comments, may implicitly signal that they are Wikipedia outsiders, increasing the odds that Wikipedia insiders may target or discount their contributions. Becoming a Wikipedia insider involves non-trivial costs: the contributor is expected to learn Wikipedia-specific technological codes, submit to a sometimes convoluted dispute resolution process, and learn a "baffling culture rich with in-jokes and insider references".[112] Editors who do not log in are in some sense "second-class citizens" on Wikipedia,[112] as "participants are accredited by members of the wiki community, who have a vested interest in preserving the quality of the work product, on the basis of their ongoing participation",[113] but the contribution histories of anonymous unregistered editors recognized only by theirIP addresses cannot be attributed to a particular editor with certainty.[113]
Studies
A 2007 study by researchers fromDartmouth College found that "anonymous and infrequent contributors to Wikipedia ... are as reliable a source of knowledge as those contributors who register with the site".[114] Jimmy Wales stated in 2009 that "[I]t turns out over 50% of all the edits are done by just 0.7% of the users ... 524 people ... And in fact, the most active 2%, which is 1400 people, have done 73.4% of all the edits."[109] However,Business Insider editor and journalistHenry Blodget showed in 2009 that in a random sample of articles, most Wikipedia content (measured by the amount of contributed text that survives to the latest sampled edit) is created by "outsiders", while most editing and formatting is done by "insiders".[109]
A 2008 study found that Wikipedians were less agreeable, open, and conscientious than others,[115] although a later commentary pointed out serious flaws, including that the data showed higher openness and that the differences with the control group and the samples were small.[116] According to a 2009 study, there is "evidence of growing resistance from the Wikipedia community to new content".[117]
Diversity
Several studies have shown that most volunteer Wikipedia contributors are male. Notably, the results of a Wikimedia Foundation survey in 2008 showed that only 13 percent of Wikipedia editors were female.[118] Because of this, universities throughout the United States tried to encourage women to become Wikipedia contributors.[119] Similarly, many of these universities, includingYale andBrown, gave college credit to students who create or edit an article relating to women in science or technology.[119]Andrew Lih, a professor and scientist, said that the reason he thought the number of male contributors outnumbered the number of females so greatly was because identifying as a woman may expose oneself to "ugly, intimidating behavior".[120] Data has shown that Africans are underrepresented among Wikipedia editors.[121]
There are currently 342 language editions of Wikipedia (also calledlanguage versions, or simplyWikipedias). As of March 2025, the six largest, in order of article count, are theEnglish,Cebuano,German,French,Swedish, andDutch Wikipedias.[W 43] The second and fifth-largest Wikipedias owe their position to the article-creating botLsjbot, which as of 2013[update] had created about half the articles on theSwedish Wikipedia, and most of the articles in theCebuano andWaray Wikipedias. The latter are both languages of thePhilippines.
Since Wikipedia is based on theWeb and therefore worldwide, contributors to the same language edition may use different dialects or may come from different countries (as is the case for the English edition). These differences may lead to some conflicts overspelling differences (e.g.colour versuscolor)[W 46] or points of view.[W 47]
Though the various language editions are held to global policies such as "neutral point of view", they diverge on some points of policy and practice, most notably on whether images that are notlicensed freely may be used under a claim offair use.[W 48][123]
Jimmy Wales has described Wikipedia as "an effort to create and distribute a free encyclopedia of the highest possible quality to every single person on the planet in their own language".[W 49] Though each language edition functions more or less independently, some efforts are made to supervise them all. They are coordinated in part by Meta-Wiki, the Wikimedia Foundation's wiki devoted to maintaining all its projects (Wikipedia and others).[W 50] For instance, Meta-Wiki provides important statistics on all language editions of Wikipedia,[W 51] and it maintains a list of articles every Wikipedia should have.[W 52] The list concerns basic content by subject: biography, history, geography, society, culture, science, technology, and mathematics.[W 52] It is not rare for articles strongly related to a particular language not to have counterparts in another edition. For example, articles about small towns in the United States might be available only in English, even when they meet the notability criteria of other language Wikipedia projects.[W 32]
Estimation of contributions shares from different regions in the world to different Wikipedia editions[124]
Translated articles represent only a small portion of articles in most editions, in part because those editions do not allow fully automated translation of articles. Articles available in more than one language may offer "interwiki links", which link to the counterpart articles in other editions.[125][W 53]
A study published byPLOS One in 2012 also estimated the share of contributions to different editions of Wikipedia from different regions of the world. It reported that the proportion of the edits made from North America was 51% for the English Wikipedia, and 25% for theSimple English Wikipedia.[124]
English Wikipedia editor numbers
On March 1, 2014,The Economist, in an article titled "The Future of Wikipedia", cited a trend analysis concerning data published by the Wikimedia Foundation stating that "the number of editors for the English-language version has fallen by a third in seven years."[126] The attrition rate for active editors in English Wikipedia was cited byThe Economist as substantially in contrast to statistics for Wikipedia in other languages (non-English Wikipedia).The Economist reported that the number of contributors with an average of five or more edits per month was relatively constant since 2008 for Wikipedia in other languages at approximately 42,000 editors within narrow seasonal variances of about 2,000 editors up or down. The number of active editors in English Wikipedia, by sharp comparison, was cited as peaking in 2007 at approximately 50,000 and dropping to 30,000 by the start of 2014.[126]
In contrast, the trend analysis for Wikipedia in other languages (non-English Wikipedia) shows success in retaining active editors on a renewable and sustained basis, with their numbers remaining relatively constant at approximately 42,000. No comment was made concerning which of the differentiated edit policy standards from Wikipedia in other languages (non-English Wikipedia) would provide a possible alternative to English Wikipedia for effectively improving substantial editor attrition rates on the English-language Wikipedia.[126]
JournalistsOliver Kamm andEdwin Black alleged (in 2010 and 2011 respectively) that articles are dominated by the loudest and most persistent voices, usually by a group with an "ax to grind" on the topic.[128][132] A 2008 article inEducation Next journal concluded that as a resource about controversial topics, Wikipedia is subject to manipulation andspin.[133] In 2020,Omer Benjakob andStephen Harrison noted that "Media coverage of Wikipedia has radically shifted over the past two decades: once cast as an intellectual frivolity, it is now lauded as the 'last bastion of shared reality' online."[134]
Multiple news networks and pundits have accused Wikipedia of beingideologically biased. In February 2021,Fox News accused Wikipedia of whitewashingcommunism andsocialism and having too much "leftist bias".[135] Wikipedia co-founderSanger said that Wikipedia has become a "propaganda" for the left-leaning "establishment" and warned the site can no longer be trusted.[136] In 2022, libertarianJohn Stossel opined that Wikipedia, a site he financially supported at one time, appeared to have gradually taken a significant turn in bias to the political left, specifically on political topics.[137] Some studies suggest that Wikipedia (and in particular the English Wikipedia) has a "westerncultural bias" (or "pro-western bias")[138] or "Eurocentric bias",[139] reiterating, says Anna Samoilenko, "similar biases that are found in the 'ivory tower' of academic historiography". Carwil Bjork-James proposes that Wikipedia could follow the diversification pattern of contemporary scholarship[140] and Dangzhi Zhao calls for a "decolonization" of Wikipedia to reduce bias from opinionated White male editors.[141]
Articles for traditional encyclopedias such asEncyclopædia Britannica are written byexperts, lending such encyclopedias a reputation for accuracy.[142] However, a peer review in 2005 of forty-two scientific entries on both Wikipedia andEncyclopædia Britannica by the science journalNature found few differences in accuracy, and concluded that "the average science entry in Wikipedia contained around four inaccuracies;Britannica, about three."[143] Joseph Reagle suggested that while the study reflects "a topical strength of Wikipedia contributors" in science articles, "Wikipedia may not have fared so well using a random sampling of articles or on humanities subjects."[144]
Others raised similar critiques.[145] The findings byNature were disputed byEncyclopædia Britannica,[146][147] and in response,Nature gave a rebuttal of the points raised byBritannica.[148] In addition to the point-for-point disagreement between these two parties, others have examined the sample size and selection method used in theNature effort, and suggested a "flawed study design" (inNature's manual selection of articles, in part or in whole, for comparison), absence of statistical analysis (e.g., of reportedconfidence intervals), and a lack of study "statistical power" (i.e., owing to smallsample size, 42 or 4 × 101 articles compared, vs >105 and >106 set sizes forBritannica and the English Wikipedia, respectively).[149]
As a consequence of the open structure, Wikipedia "makes no guarantee of validity" of its content, since no one is ultimately responsible for any claims appearing in it.[W 54] Concerns have been raised byPC World in 2009 regarding the lack ofaccountability that results from users' anonymity, the insertion of false information,[150]vandalism, and similar problems.Legal Research in a Nutshell (2011), cites Wikipedia as a "general source" that "can be a real boon" in "coming up to speed in the law governing a situation" and, "while not authoritative, can provide basic facts as well as leads to more in-depth resources".[151]
EconomistTyler Cowen wrote: "If I had to guess whether Wikipedia or the median refereed journal article on economics was more likely to be true after a not so long think I would opt for Wikipedia." He comments that some traditional sources of non-fiction suffer from systemic biases, and novel results, in his opinion, are over-reported in journal articles as well as relevant information being omitted from news reports. However, he also cautions that errors are frequently found on Internet sites and that academics and experts must be vigilant in correcting them.[152]Amy Bruckman has argued that, due to the number of reviewers, "the content of a popular Wikipedia page is actually the most reliable form of information ever created".[153] In September 2022,The Sydney Morning Herald journalist Liam Mannix noted that: "There's no reason to expect Wikipedia to be accurate ... And yet it [is]." Mannix further discussed the multiple studies that have proved Wikipedia to be generally as reliable asEncyclopædia Britannica, summarizing that "...turning our back on such an extraordinary resource is... well, a little petty."[154]
Critics argue that Wikipedia's open nature and a lack of proper sources for most of the information makes it unreliable.[155] Some commentators suggest that Wikipedia may be reliable, but that the reliability of any given article is not clear.[156] Editors of traditionalreference works such as theEncyclopædia Britannica have questioned the project'sutility and status as an encyclopedia.[157] Wikipedia co-founderJimmy Wales has claimed that Wikipedia has largely avoided the problem of "fake news" because the Wikipedia community regularly debates the quality of sources in articles.[158]
Wikipedia's open structure inherently makes it an easy target forInternet trolls,spammers, and various forms of paid advocacy seen as counterproductive to the maintenance of a neutral and verifiable online encyclopedia.[68][W 55]In response topaid advocacy editing and undisclosed editing issues, Wikipedia was reported in an article inThe Wall Street Journal to have strengthened its rules and laws against undisclosed editing.[160] The article stated that: "Beginning Monday [from the date of the article, June 16, 2014], changes in Wikipedia's terms of use will require anyone paid to edit articles to disclose that arrangement.Katherine Maher, the nonprofit Wikimedia Foundation's chief communications officer, said the changes address a sentiment among volunteer editors that 'we're not an advertising service; we're an encyclopedia.'"[160][161][162][163][164] These issues, among others, had been parodied since the first decade of Wikipedia, notably byStephen Colbert onThe Colbert Report.[165]
Discouragement in education
Some university lecturers discourage students from citing any encyclopedia inacademic work, preferringprimary sources;[166] some specifically prohibit Wikipedia citations.[167][168] Wales stresses that encyclopedias of any type are not usually appropriate to use as citable sources, and should not be relied upon as authoritative.[169] Wales once (2006 or earlier) said he receives about ten emails weekly from students saying they got failing grades on papers because they cited Wikipedia; he told the students they got what they deserved. "For God's sake, you're in college; don't cite the encyclopedia", he said.[170]
In February 2007, an article inThe Harvard Crimson newspaper reported that a few of the professors atHarvard University were including Wikipedia articles in theirsyllabi, although without realizing the articles might change.[171] In June 2007,Michael Gorman, former president of theAmerican Library Association, condemned Wikipedia, along with Google, stating that academics who endorse the use of Wikipedia are "the intellectual equivalent of a dietitian who recommends a steady diet of Big Macs with everything".[172]
A 2020 research study published inStudies in Higher Education argued that Wikipedia could be applied in the higher education "flipped classroom", an educational model where students learn before coming to class and apply it in classroom activities. The experimental group was instructed to learn before class and get immediate feedback before going in (the flipped classroom model), while the control group was given direct instructions in class (the conventional classroom model). The groups were then instructed to collaboratively develop Wikipedia entries, which would be graded in quality after the study. The results showed that the experimental group yielded more Wikipedia entries and received higher grades in quality. The study concluded that learning with Wikipedia in flipped classrooms was more effective than in conventional classrooms, demonstrating Wikipedia could be used as an educational tool in higher education.[173]
On March 5, 2014, Julie Beck writing forThe Atlantic magazine in an article titled "Doctors' #1 Source for Healthcare Information: Wikipedia", stated that "Fifty percent of physicians look up conditions on the (Wikipedia) site, and some are editing articles themselves to improve the quality of available information."[174] Beck continued to detail in this article new programs ofAmin Azzam at theUniversity of San Francisco to offer medical school courses to medical students for learning to edit and improveWikipedia articles on health-related issues, as well as internal quality control programs within Wikipedia organized byJames Heilman to improve a group of 200 health-related articles of central medical importance up to Wikipedia's highest standard of articles using its Featured Article and Good Article peer-review evaluation process.[174] In a May 7, 2014, follow-up article inThe Atlantic titled "Can Wikipedia Ever Be a Definitive Medical Text?", Julie Beck quotes WikiProject Medicine's James Heilman as stating: "Just because a reference is peer-reviewed doesn't mean it's a high-quality reference."[175] Beck added that: "Wikipedia has its own peer review process before articles can be classified as 'good' or 'featured'. Heilman, who has participated in that process before, says 'less than one percent' of Wikipedia's medical articles have passed."[175]
Wikipedia seeks to create a summary of all human knowledge in the form of an online encyclopedia, with each topic covered encyclopedically in one article. Since it hasterabytes ofdisk space, it can have far more topics than can be covered by any printed encyclopedia.[W 56] The exact degree and manner of coverage on Wikipedia is under constant review by its editors, and disagreements are not uncommon (seedeletionism and inclusionism).[176][177] Wikipedia contains materials that some people may find objectionable, offensive, or pornographic.[W 57] The "Wikipedia is not censored" policy has sometimes proved controversial: in 2008, Wikipedia rejected an online petition against the inclusion ofimages of Muhammad in theEnglish edition of itsMuhammad article, citing this policy.[178] The presence of politically, religiously, and pornographically sensitive materials in Wikipedia has led to thecensorship of Wikipedia by national authorities in China[179] and Pakistan,[180] among other countries.[181][182][183]
Through its "Wikipedia Loves Libraries" program, Wikipedia has partnered with major public libraries such as theNew York Public Library for the Performing Arts to expand its coverage of underrepresented subjects and articles.[184] A 2011 study conducted by researchers at theUniversity of Minnesota indicated that male and female editors focus on different coverage topics. There was a greater concentration of females in the "people and arts" category, while males focus more on "geography and science".[185]
Coverage of topics and bias
Research conducted by Mark Graham of theOxford Internet Institute in 2009 indicated that the geographic distribution of article topics is highly uneven, Africa being the most underrepresented.[186] Across 30 language editions of Wikipedia, historical articles and sections are generallyEurocentric and focused on recent events.[187]
Academic studies of Wikipedia have consistently shown that Wikipedia systematically over-represents a point of view (POV) belonging to a particular demographic described as the "average Wikipedian", who is an educated, technically inclined, English-speaking white male, aged 15–49, from a developed Christian country[example needed] in the northern hemisphere.[189] This POV is over-represented in relation to all existing POVs.[190][191] This systemic bias in editor demographic results incultural bias,gender bias, andgeographical bias on Wikipedia.[192][193] There are two broad types of bias, which areimplicit (when a topic is omitted) andexplicit (when a certain POV is over-represented in an article or by references).[190]
Interdisciplinary scholarly assessments of Wikipedia articles have found that while articles are typically accurate and free of misinformation, they are also typically incomplete and fail to present all perspectives with aneutral point of view.[192] In 2011, Wales claimed that the unevenness of coverage is a reflection of the demography of the editors, citing for example "biographies of famous women through history and issues surrounding early childcare".[35] The October 22, 2013, essay by Tom Simonite in MIT'sTechnology Review titled "The Decline of Wikipedia" discussed the effect of systemic bias andpolicy creep on thedownward trend in the number of editors.[36]
Wikipedia has been criticized for allowing information about graphic content.[194] Articles depicting what some critics have called objectionable content (such asfeces,cadaver,human penis,vulva, and nudity) contain graphic pictures and detailed information easily available to anyone with access to the internet, including children.[W 58] The site also includessexual content such as images and videos ofmasturbation andejaculation, illustrations ofzoophilia, and photos fromhardcore pornographic films in its articles. It also has non-sexualphotographs of nude children.[W 59]
The Wikipedia article aboutVirgin Killer—a 1976 album from the German rock bandScorpions—features a picture of the album's original cover, which depicts a nakedprepubescent girl. The original release cover caused controversy and was replaced in some countries. In December 2008, access to the Wikipedia articleVirgin Killer was blocked for four days by mostInternet service providers in the United Kingdom after theInternet Watch Foundation (IWF) decided the album cover was a potentially illegal indecent image and added the article's URL to a "blacklist" it supplies to British internet service providers.[195]
In April 2010, Sanger wrote a letter to the Federal Bureau of Investigation, outlining his concerns that two categories of images onWikimedia Commons contained child pornography, and were in violation ofUS federal obscenity law.[196][197] Sanger later clarified that the images, which were related topedophilia and one aboutlolicon, were not of real children, but said that they constituted "obscene visual representations of the sexual abuse of children", under thePROTECT Act of 2003.[198] That law bans photographic child pornography and cartoon images and drawings of children that areobscene under American law.[198] Sanger also expressed concerns about access to the images on Wikipedia in schools.[199]
Wikimedia Foundation spokesman Jay Walsh strongly rejected Sanger's accusation,[200] saying that Wikipedia did not have "material we would deem to be illegal. If we did, we would remove it."[200] Following the complaint by Sanger, Wales deleted sexual images without consulting the community. After some editors who volunteered to maintain the site argued that the decision to delete had been made hastily, Wales voluntarily gave up some of the powers he had held up to that time as part of his co-founder status. He wrote in a message to the Wikimedia Foundation mailing-list that this action was "in the interest of encouraging this discussion to be about real philosophical/content issues, rather than be about me and how quickly I acted".[201] Critics, includingWikipediocracy, noticed that many of the pornographic images deleted from Wikipedia since 2010 have reappeared.[202]
Privacy
Oneprivacy concern in the case of Wikipedia is the right of a private citizen to remain a "private citizen" rather than a "public figure" in the eyes of the law.[203][g] It is a battle between the right to be anonymous incyberspace and the right to be anonymous inreal life. The Wikimedia Foundation'sprivacy policy states, "we believe that you shouldn't have to provide personal information to participate in the free knowledge movement", and states that "personal information" may be shared "For legal reasons", "To Protect You, Ourselves & Others", or "To Understand & Experiment".[W 60]
In January 2006, a German court ordered theGerman Wikipedia shut down within Germany because it stated the full name ofBoris Floricic, aka "Tron", a deceased hacker. On February 9, 2006, the injunction against Wikimedia Deutschland was overturned, with the court rejecting the notion that Tron'sright to privacy or that of his parents was being violated.[204]
Wikipedia has a "Volunteer Response Team" that uses Znuny, afree and open-source software fork ofOTRS[W 61] to handle queries without having to reveal the identities of the involved parties. This is used, for example, in confirming the permission for using individual images and other media in the project.[W 62]
In late April 2023, Wikimedia Foundation announced that Wikipedia will not submit to any age verifications that may be required by the UK'sOnline Safety Bill legislation. Rebecca MacKinnon of the Wikimedia Foundation said that such checks would run counter to the website's commitment to minimal data collection on its contributors and readers.[205]
Wikipedia was described in 2015 as harboring a battleground culture ofsexism andharassment.[206][207] The perceived tolerance of abusive language was a reason put forth in 2013 for the gender gap in Wikipedia editorship.[208]Edit-a-thons have been held to encourage female editors and increase the coverage of women's topics.[209]
In May 2018, a Wikipedia editor rejected a submitted article aboutDonna Strickland due to lack of coverage in the media.[W 63][210] Five months later, Strickland won aNobel Prize in Physics "for groundbreaking inventions in the field of laser physics", becoming the third woman to ever receive the award.[210][211] Prior to winning the award, Strickland's only mention on Wikipedia was in the article about her collaborator and co-winner of the awardGérard Mourou.[210] Her exclusion from Wikipedia led to accusations of sexism, but Corinne Purtill writing forQuartz argued that "it's also a pointed lesson in the hazards of gender bias in media, and of the broader consequences of underrepresentation."[212] Purtill attributes the issue to the gender bias in media coverage.[212]
A comprehensive 2008 survey, published in 2016, by Julia B. Bear ofStony Brook University's College of Business and Benjamin Collier ofCarnegie Mellon University found significant gender differences in confidence in expertise, discomfort with editing, and response to critical feedback. "Women reported less confidence in their expertise, expressed greater discomfort with editing (which typically involves conflict), and reported more negative responses to critical feedback compared to men."[213]
Katherine Maher, the third executive director of Wikimedia, served from 2016 to 2021.
Wikipedia is hosted and funded by theWikimedia Foundation, a non-profit organization which also operates Wikipedia-related projects such asWiktionary andWikibooks.[W 64] The foundation relies on public contributions and grants to fund its mission.[214][W 65] The foundation's 2020 Internal Revenue ServiceForm 990 shows revenue of $124.6 million and expenses of almost $112.2 million, with assets of about $191.2 million and liabilities of almost $11 million.[W 66]
In May 2014, Wikimedia Foundation namedLila Tretikov as its second executive director, taking over for Sue Gardner.[W 67]TheWall Street Journal reported on May 1, 2014, that Tretikov's information technology background, from her years at University of California offers Wikipedia an opportunity to develop in more concentrated directions guided by her often repeated position statement that, "Information, like air, wants to be free."[215][216] The sameWall Street Journal article reported these directions of development according to an interview with spokesman Jay Walsh of Wikimedia, who "said Tretikov would address that issue (paid advocacy) as a priority. 'We are really pushing toward more transparency ... We are reinforcing that paid advocacy is not welcome.' Initiatives to involve greater diversity of contributors, better mobile support of Wikipedia, new geo-location tools to find local content more easily, and more tools for users in the second and third world are also priorities", Walsh said.[215]
Following the departure of Tretikov from Wikipedia due to issues concerning the use of the "superprotection" feature which some language versions of Wikipedia have adopted,[W 68]Katherine Maher became the third executive director of the Wikimedia Foundation in June 2016.[W 69] Maher stated that one of her priorities would be the issue of editor harassment endemic to Wikipedia as identified by the Wikipedia board in December. She said toBloomberg Businessweek regarding the harassment issue that: "It establishes a sense within the community that this is a priority ... [and that correction requires that] it has to be more than words."[120]
Maher served as executive director until April 2021.[217]Maryana Iskander was named the incoming CEO in September 2021, and took over that role in January 2022. She stated that one of her focuses would be increasing diversity in the Wikimedia community.[218]
Wikipedia is also supported by many organizations and groups that are affiliated with the Wikimedia Foundation but independently-run, calledWikimedia movement affiliates. These includeWikimedia chapters (which are national or sub-national organizations, such as Wikimedia Deutschland and Wikimedia France), thematic organizations (such as Amical Wikimedia for theCatalan language community), and user groups. These affiliates participate in the promotion, development, and funding of Wikipedia.[W 70]
The operation of Wikipedia depends onMediaWiki, a custom-made,free and open sourcewiki software platform written inPHP and built upon theMySQL database system.[W 71] The software incorporates programming features such as amacro language,variables, atransclusion system fortemplates, andURL redirection.[W 72] MediaWiki is licensed under theGNU General Public License (GPL) and it is used by all Wikimedia projects, as well as many other wiki projects.[W 71][W 73] Originally, Wikipedia ran onUseModWiki written inPerl by Clifford Adams (Phase I), which initially requiredCamelCase for article hyperlinks; the present double bracket style was incorporated later.[W 74] Starting in January 2002 (Phase II), Wikipedia began running on aPHP wiki engine with a MySQL database; this software was custom-made for Wikipedia byMagnus Manske. The Phase II software was repeatedly modified to accommodate theexponentially increasing demand. In July 2002 (Phase III), Wikipedia shifted to the third-generation software, MediaWiki, originally written byLee Daniel Crocker.
Several MediaWiki extensions are installed to extend the functionality of the MediaWiki software.[W 75] In April 2005, aLucene extension[W 76][W 77] was added to MediaWiki's built-in search and Wikipedia switched from MySQL to Lucene for searching. Lucene was later replaced by CirrusSearch which is based onElasticsearch.[W 78] In July 2013, after extensive beta testing, aWYSIWYG (What You See Is What You Get) extension,VisualEditor, was opened to public use.[219][220][221] It was met with much rejection and criticism, and was described as "slow and buggy".[222] The feature was changed from opt-out to opt-in afterward.[W 79]
Computer programs calledbots have often been used to perform simple and repetitive tasks, such as correcting common misspellings and stylistic issues, or to start articles such as geography entries in a standard format from statistical data.[W 80][223][224] One controversial contributor,Sverker Johansson, created articles with his botLsjbot, which was reported to create up to 10,000 articles on the Swedish Wikipedia on certain days.[225] Additionally, there are bots designed to automatically notify editors when they make common editing errors (such as unmatched quotes or unmatched parentheses).[W 81] Edits falsely identified by bots as the work of a banned editor can be restored by other editors. An anti-vandal bot is programmed to detect and revert vandalism quickly.[223] Bots are able to indicate edits from particular accounts orIP address ranges, as occurred at the time of the shooting down of theMH17 jet in July 2014 when it was reported that edits were made via IPs controlled by the Russian government.[226] Bots on Wikipedia must be approved before activation.[W 82] According toAndrew Lih, the current expansion of Wikipedia to millions of articles would be difficult to envision without the use of such bots.[227]
Hardware operations and support
Overview of system architecture as of August 2022[update]
As of 2021,[update] page requests are first passed to a front-end layer ofVarnish caching servers and back-end layercaching is done byApache Traffic Server.[W 83] Requests that cannot be served from the Varnish cache are sent to load-balancing servers running theLinux Virtual Server software, which in turn pass them to one of the Apache web servers for page rendering from the database.[W 83] The web servers deliver pages as requested, performing page rendering for all the language editions of Wikipedia. To increase speed further, rendered pages are cached in a distributed memory cache until invalidated, allowing page rendering to be skipped entirely for most common page accesses.[228]
Wikipedia currently runs on dedicatedclusters ofLinux servers running theDebian operating system.[W 84] By January 22, 2013, Wikipedia had migrated its primary data center to anEquinix facility inAshburn, Virginia.[W 85][229] In 2017, Wikipedia installed a caching cluster in an Equinix facility inSingapore, the first of its kind in Asia.[W 86] In 2022, a caching data center was opened inMarseille, France.[W 87] In 2024, a caching data center was opened inSão Paulo, the first of its kind in South America.[W 88] As of November 2024,[update] caching clusters are located inAmsterdam, San Francisco, Singapore, Marseille, and São Paulo.[W 25][W 89]
Internal research and operational development
Following growing amounts of incoming donations in 2013 exceeding seven digits,[36] the Foundation has reached a threshold of assets which qualify its consideration under the principles ofindustrial organization economics to indicate the need for the re-investment of donations into the internal research and development of the Foundation.[230] Two projects of such internal research and development have been the creation of a Visual Editor and the "Thank" tab in the edit history, which were developed to improve issues of editor attrition.[36][222] The estimates for reinvestment by industrial organizations into internal research and development was studied byAdam Jaffe, who recorded that the range of 4% to 25% annually was to be recommended, with high-end technology requiring the higher level of support for internal reinvestment.[231] At the 2013 level of contributions for Wikimedia presently documented as 45 million dollars,[W 90] the computed budget level recommended by Jaffe for reinvestment into internal research and development is between 1.8 million and 11.3 million dollars annually.[231] In 2019, the level of contributions were reported by the Wikimedia Foundation as being at $120 million annually,[W 91] updating the Jaffe estimates for the higher level of support to between $3.08 million and $19.2 million annually.[231]
Multiple Wikimedia projects have internal news publications.Wikimedia's online newspaperThe Signpost was founded in 2005 by Michael Snow, a Wikipedia administrator who would join the Wikimedia Foundation's board of trustees in 2008.[232][233] The publication covers news and events from the English Wikipedia, the Wikimedia Foundation, andWikipedia's sister projects.[W 92]
The Wikipedia Library is a resource for Wikipedia editors which provides free access to a wide range ofdigital publications, so that they can consult and cite these while editing the encyclopedia.[234][235] Over 60 publishers have partnered with The Wikipedia Library to provide access to their resources: whenICE Publishing joined in 2020, a spokesman said "By enabling free access to our content for Wikipedia editors, we hope to further the research community's resources – creating and updating Wikipedia entries on civil engineering which are read by thousands of monthly readers."[236]
When the project was started in 2001, all text in Wikipedia was covered by theGNU Free Documentation License (GFDL), acopyleft license permitting the redistribution, creation of derivative works, and commercial use of content while authors retain copyright of their work.[W 24] The GFDL was created for software manuals that come withfree software programs licensed under theGPL. This made it a poor choice for a general reference work: for example, the GFDL requires the reprints of materials from Wikipedia to come with a full copy of the GFDL text.[237] In December 2002, theCreative Commons license was released; it was specifically designed for creative works in general, not just for software manuals. The Wikipedia project sought the switch to the Creative Commons.[W 93] Because the GFDL and Creative Commons were incompatible, in November 2008, following the request of the project, theFree Software Foundation (FSF) released a new version of the GFDL designed specifically to allow Wikipedia to relicense its content to CC BY-SA by August 1, 2009.[W 94] In April 2009, Wikipedia and its sister projects held a community-wide referendum which decided the switch in June 2009.[W 95][W 96][W 97][W 98]
The handling of media files (e.g. image files) varies across language editions. Some language editions, such as the English Wikipedia, include non-free image files underfair use doctrine,[W 99] while the others have opted not to, in part because of the lack of fair use doctrines in their home countries (e.g. inJapanese copyright law). Media files covered byfree content licenses (e.g.Creative Commons'CC BY-SA) are shared across language editions viaWikimedia Commons repository, a project operated by the Wikimedia Foundation.[W 100] Wikipedia's accommodation of varying international copyright laws regarding images has led some to observe that its photographic coverage of topics lags behind the quality of the encyclopedic text.[238] The Wikimedia Foundation is not a licensor of content on Wikipedia or its related projects but merely a hosting service for contributors to and licensors of Wikipedia, a position which was successfully defended in 2004 in a court in France.[239][240]
Methods of access
Because Wikipedia content is distributed under an open license, anyone can reuse or re-distribute it at no charge.[W 101] The content of Wikipedia has been published in many forms, both online and offline, outside the Wikipedia website.
Thousands of "mirror sites" exist that republish content from Wikipedia; two prominent ones that also include content from other reference sources areReference.com andAnswers.com.[241][242] Another example isWapedia, which began to display Wikipedia content in a mobile-device-friendly format before Wikipedia itself did.[W 102] Some websearch engines make special use of Wikipedia content when displaying search results: examples includeMicrosoft Bing (via technology gained fromPowerset)[243] andDuckDuckGo.
Collections of Wikipedia articles have been published onoptical discs. An English version released in 2006 contained about 2,000 articles.[W 103] The Polish-language version from 2006 contains nearly 240,000 articles,[W 104] the German-language version from 2007/2008 contains over 620,000 articles,[W 105] and the Spanish-language version from 2011 contains 886,000 articles.[W 106] Additionally, "Wikipedia for Schools", the Wikipedia series of CDs / DVDs produced by Wikipedia andSOS Children, is a free selection from Wikipedia designed for education towards children eight to seventeen.[W 107]
There have been efforts to put a select subset of Wikipedia's articles into printed book form.[244][W 108] Since 2009, tens of thousands ofprint-on-demand books that reproduced English, German, Russian, and French Wikipedia articles have been produced by the American companyBooks LLC and by three Mauritian subsidiaries of the German publisherVDM.[245]
The websiteDBpedia, begun in 2007, extracts data from the infoboxes and category declarations of the English-language Wikipedia.[246] Wikimedia has created theWikidata project with a similar objective of storing the basic facts from each page of Wikipedia and other Wikimedia Foundation projects and make it available in a queryablesemantic format,RDF.[W 109] As of February 2023,[update] it has over 101 million items.[W 110]WikiReader is a dedicated reader device that contains an offline copy of Wikipedia, which was launched byOpenMoko and first released in 2009.[W 111]
Obtaining the full contents of Wikipedia for reuse presents challenges, since direct cloning via aweb crawler is discouraged.[W 112] Wikipedia publishes "dumps" of its contents, but these are text-only; as of 2023,[update] there is no dump available of Wikipedia's images.[W 113]Wikimedia Enterprise is a for-profit solution to this.[247]
Several languages of Wikipedia also maintain a reference desk, where volunteers answer questions from the general public. According to a study by Pnina Shachaf in theJournal of Documentation, the quality of the Wikipedia reference desk is comparable to a standard libraryreference desk, with an accuracy of 55 percent.[248]
A mobile version showing the English Wikipedia's Main Page on October 2, 2024
Wikipedia's original medium was for users to read and edit content using any standardweb browser through a fixedInternet connection. Although Wikipedia content has been accessible through themobile web since July 2013,The New York Times on February 9, 2014, quotedErik Möller, deputy director of the Wikimedia Foundation, stating that the transition of internet traffic from desktops to mobile devices was significant and a cause for concern and worry. The article inThe New York Times reported the comparison statistics for mobile edits stating that, "Only 20 percent of the readership of the English-language Wikipedia comes via mobile devices, a figure substantially lower than the percentage of mobile traffic for other media sites, many of which approach 50 percent. And the shift to mobile editing has lagged even more." In 2014The New York Times reported that Möller has assigned "a team of 10 software developers focused on mobile", out of a total of approximately 200 employees working at the Wikimedia Foundation. One principal concern cited byThe New York Times for the "worry" is for Wikipedia to effectively address attrition issues with the number of editors which the online encyclopedia attracts to edit and maintain its content in a mobile access environment.[43] By 2023, the Wikimedia Foundation's staff had grown to over 700 employees.[3]
Access to Wikipedia from mobile phones was possible as early as 2004, through theWireless Application Protocol (WAP), via theWapedia service.[W 102] In June 2007, Wikipedia launched en.mobile.wikipedia.org, an official website for wireless devices. In 2009, a newer mobile service was officially released, located at en.m.wikipedia.org, which caters to more advanced mobile devices such as theiPhone,Android-based devices, orWebOS-based devices.[W 114] Several other methods of mobile access to Wikipedia have emerged since. Many devices and applications optimize or enhance the display of Wikipedia content for mobile devices, while some also incorporate additional features such as use of Wikipediametadata likegeoinformation.[249][250]
The Android app for Wikipedia was released in January 2012, to over 500,000 installs and generally positive reviews, scoring over four of a possible five in a poll of approximately 200,000 users downloading from Google.[W 115][W 116] The version for iOS was released on April 3, 2013, to similar reviews.[W 117]Wikipedia Zero was an initiative of the Wikimedia Foundation to expand the reach of the encyclopedia to the developing countries by partnering with mobile operators to allow free access.[W 118][251] It was discontinued in February 2018 due to lack of participation from mobile operators.[W 118]
Andrew Lih andAndrew Brown both maintain editing Wikipedia withsmartphones is difficult and this discourages new potential contributors.[252][253] Lih states that the number of Wikipedia editors has been declining after several years,[252] and Tom Simonite ofMIT Technology Review claims the bureaucratic structure and rules are a factor in this. Simonite alleges someWikipedians use the labyrinthine rules and guidelines to dominate others and those editors have a vested interest in keeping the status quo.[36] Lih alleges there is a serious disagreement among existing contributors on how to resolve this. Lih fears for Wikipedia's long-term future while Brown fears problems with Wikipedia will remain and rival encyclopedias will not replace it.[252][253]
Chinese access
Access to Wikipedia has beenblocked inmainland China since May 2015.[8][254][255] This was done after Wikipedia started to useHTTPS encryption, which made selective censorship more difficult.[256]
Cultural influence
Trusted source to combat fake news
In 2017–18, after a barrage of false news reports, both Facebook and YouTube announced they would rely on Wikipedia to help their users evaluate reports and reject false news.[13][14]Noam Cohen, writing inThe Washington Post states, "YouTube's reliance on Wikipedia to set the record straight builds on the thinking of another fact-challenged platform, the Facebook social network, which announced last year that Wikipedia would help its users root out 'fake news'."[14][257]
Readership
In February 2014,The New York Times reported that Wikipedia was ranked fifth globally among all websites, stating "With 18 billion page views and nearly 500 million unique visitors a month, ... Wikipedia trails just Yahoo, Facebook, Microsoft and Google, the largest with 1.2 billion unique visitors."[43] However, its ranking dropped to 13th globally by June 2020 due mostly to a rise in popularity of Chinese websites for online shopping.[56] The website has since recovered its ranking as of April 2022.[56]
In addition tologistic growth in the number of its articles,[W 119] Wikipedia has steadily gained status as a general reference website since its inception in 2001.[258] The number of readers of Wikipedia worldwide reached 365 million at the end of 2009.[W 120] ThePew Internet and American Life project found that one third of US Internet users consulted Wikipedia.[259] In 2011,Business Insider gave Wikipedia a valuation of $4 billion if it ran advertisements.[260]
According to "Wikipedia Readership Survey 2011", the average age of Wikipedia readers is 36, with a rough parity between genders. Almost half of Wikipedia readers visit the site more than five times a month, and a similar number of readers specifically look for Wikipedia in search engine results. About 47 percent of Wikipedia readers do not realize that Wikipedia is a non-profit organization.[W 121] As of February 2023,[update] Wikipedia attracts around 2 billion unique devices monthly, with the English Wikipedia receiving 10 billionpageviews each month.[W 1]
During theCOVID-19 pandemic, Wikipedia's coverage of the pandemic and fight against misinformation received international media attention, and brought an increase in Wikipedia readership overall.[261][262][263][264] Noam Cohen wrote inWired that Wikipedia's effort to combatmisinformation related to the pandemic was different from other major websites, opining, "Unless Twitter, Facebook andthe others can learn to address misinformation more effectively, Wikipedia will remain the last best place on the Internet."[262] In October 2020, theWorld Health Organization announced they were freely licensing itsinfographics and other materials on Wikimedia projects.[265] There were nearly 7,000 COVID-19 related Wikipedia articles across 188 different Wikipedias, as of November 2021.[update][266][267]
Wikipedia's content has also been used in academic studies, books, conferences, and court cases.[W 122][268][269] TheParliament of Canada's website refers to Wikipedia's article onsame-sex marriage in the "related links" section of its "further reading" list for theCivil Marriage Act.[270] The encyclopedia's assertions are increasingly used as a source by organizations such as the US federal courts and theWorld Intellectual Property Organization[271]—though mainly for supporting information rather than information decisive to a case.[272] Content appearing on Wikipedia has also been cited as a source and referenced in someUS intelligence agency reports.[273] In December 2008, the scientific journalRNA Biology launched a new section for descriptions of families of RNA molecules and requires authors who contribute to the section to also submit a draft article on theRNA family for publication in Wikipedia.[274] Wikipedia has also been used as a source in journalism,[275][276] often without attribution, and several reporters have been dismissed forplagiarizing from Wikipedia.[277][278][279][280]
In 2006,Time magazine recognized Wikipedia's participation (along with YouTube,Reddit,MySpace, and Facebook) in the rapid growth of online collaboration and interaction by millions of people worldwide.[281] On September 16, 2007,The Washington Post reported that Wikipedia had become a focal point in the2008 US election campaign, saying: "Type a candidate's name into Google, and among the first results is a Wikipedia page, making those entries arguably as important as any ad in defining a candidate. Already, the presidential entries are being edited, dissected and debated countless times each day."[282] An October 2007Reuters article, titled "Wikipedia page the latest status symbol", reported the recent phenomenon of how having a Wikipedia article vindicates one's notability.[283]
One of the first times Wikipedia was involved in a governmental affair was on September 28, 2007, whenItalian politicianFranco Grillini raised a parliamentary question with the minister of cultural resources and activities about the necessity offreedom of panorama. He said that the lack of such freedom forced Wikipedia, "the seventh most consulted website", to forbid all images of modern Italian buildings and art, and claimed this was hugely damaging to tourist revenues.[284]
Wikipedia, an introduction –Erasmus Prize 2015Jimmy Wales accepts the 2008QuadrigaA Mission of Enlightenment award on behalf of Wikipedia.
A working group led byPeter Stone (formed as a part of theStanford-based projectOne Hundred Year Study on Artificial Intelligence) in its report called Wikipedia "the best-known example of crowdsourcing... that far exceeds traditionally-compiled information sources, such as encyclopedias and dictionaries, in scale and depth".[285][286]
In a 2017 opinion piece forWired,Hossein Derakhshan describes Wikipedia as "one of the last remaining pillars of theopen anddecentralized web" and contrasted its existence as a text-based source of knowledge with social media andsocial networking services, the latter having "since colonized the web for television's values". For Derakhshan, Wikipedia's goal as an encyclopedia represents theAge of Enlightenment tradition ofrationality triumphing over emotions, a trend which he considers "endangered" due to the "gradual shift from atypographic culture to a photographic one, which in turn mean[s] a shift from rationality to emotions, exposition to entertainment". Rather than "sapere aude" (lit.'dare to know'), social networks have led to a culture of "dare not to care to know". This is while Wikipedia faces "a more concerning problem" than funding, namely "a flattening growth rate in the number of contributors to the website". Consequently, the challenge for Wikipedia and those who use it is to "save Wikipedia and its promise of a free and open collection of all human knowledge amid the conquest of new and old television—how to collect and preserve knowledge when nobody cares to know."[287]
Awards
Wikipedia team visiting the Parliament of AsturiasWikipedians meeting after the 2015 Asturias awards ceremony
Wikipedia has won many awards, receiving its first two major awards in May 2004.[W 123] The first was a Golden Nica for Digital Communities of the annualPrix Ars Electronica contest; this came with a €10,000 (£6,588; $12,700) grant and an invitation to present at the PAE Cyberarts Festival in Austria later that year. The second was a Judges'Webby Award for the "community" category.[288]
In 2007, readers of brandchannel.com voted Wikipedia as the fourth-highest brand ranking, receiving 15 percent of the votes in response to the question "Which brand had the most impact on our lives in 2006?"[289]
In 2015, Wikipedia was awarded both the annualErasmus Prize, which recognizes exceptional contributions to culture, society or social sciences,[291] and the SpanishPrincess of Asturias Award on International Cooperation.[292] Speaking at the Asturian Parliament in Oviedo, the city that hosts the awards ceremony,Jimmy Wales praised the work of theAsturian Wikipedia users.[293]
ComedianStephen Colbert has parodied or referenced Wikipedia on numerous episodes of his showThe Colbert Report and coined the related termwikiality, meaning "together we can create a reality that we all agree on—the reality we just agreed on".[165] Another example can be found in "Wikipedia Celebrates 750 Years of American Independence", a July 2006 front-page article inThe Onion,[294] as well as the 2010The Onion article"'L.A. Law' Wikipedia Page Viewed 874 Times Today".[295]
In an April 2007 episode of the American television comedyThe Office, office manager (Michael Scott) is shown relying on a hypothetical Wikipedia article for information onnegotiation tactics to assist him in negotiating lesser pay for an employee.[296] Viewers of the show tried to add the episode's mention of the page as a section of the actual Wikipedia article on negotiation, but this effort was prevented by other users on the article's talk page.[297]
"My Number One Doctor", a 2007 episode of the television showScrubs, played on the perception that Wikipedia is an unreliable reference tool with a scene in whichPerry Cox reacts to a patient who says that a Wikipedia article indicates that theraw food diet reverses the effects ofbone cancer by retorting that the same editor who wrote that article also wrote theBattlestar Galactica episode guide.[298]
In 2008, the comedy websiteCollegeHumor produced a video sketch named "Professor Wikipedia", in which the fictitious Professor Wikipedia instructs a class with a medley of unverifiable and occasionally absurd statements.[299] TheDilbert comic strip from May 8, 2009, features a character supporting an improbable claim by saying "Give me ten minutes and then check Wikipedia."[300] In July 2009,BBC Radio 4 broadcast a comedy series calledBigipedia, which was set on a website which was a parody of Wikipedia.[301] Some of the sketches were directly inspired by Wikipedia and its articles.[302]
On August 23, 2013, theNew Yorker website published a cartoon with this caption: "Dammit, Manning, have you considered the pronoun war that this is going to start on your Wikipedia page?"[303] The cartoon referred toChelsea Elizabeth Manning (born Bradley Edward Manning), an American activist, politician, and former United States Army soldier who had recentlycome out as atrans woman.[304]
In June 2024,nature.com published a fictional WikipediaTalk page under the title "Plastic-eating fungus caused doomsday" by Emma Burnett. The Talk page concerned a fictional article describing the unintended consequences of the release of a plastic-eating fungus to clean up an oil spill. The article contained Talk page topics found on Wikipedia, like discussions of changes in the articlespriority level.[305]
Wikipedia has spawned several sister projects, which are also wikis run by theWikimedia Foundation. These otherWikimedia projects includeWiktionary, a dictionary project launched in December 2002,[W 124]Wikiquote, a collection of quotations created a week after Wikimedia launched,[306]Wikibooks, a collection of collaboratively written free textbooks and annotated texts,[W 125]Wikimedia Commons, a site devoted to free-knowledge multimedia,[W 126]Wikinews, for collaborative journalism,[W 127] andWikiversity, a project for the creation of free learning materials and the provision of online learning activities.[W 128] Another sister project of Wikipedia,Wikispecies, is a catalog of all species, but is not open for public editing.[307] In 2012,Wikivoyage, an editable travel guide,[308] andWikidata, an editable knowledge base, launched.[W 129]
Publishing
A group of Wikimedians of theWikimedia DC chapter at the 2013 DC Wikimedia annual meeting standing in front of theEncyclopædia Britannica(back left) at the US National Archives
The most obvious economic effect of Wikipedia has been the death of commercial encyclopedias, especially printed versions likeEncyclopædia Britannica, which were unable to compete with a product that is essentially free.[309][310][311]Nicholas Carr's 2005 essay "The amorality ofWeb 2.0" criticizes websites withuser-generated content (like Wikipedia) for possibly leading to professional (and, in his view, superior) content producers' going out of business, because "free trumps quality all the time". Carr wrote, "Implicit in the ecstatic visions of Web 2.0 is thehegemony of the amateur. I for one can't imagine anything more frightening."[312] Others dispute the notion that Wikipedia, or similar efforts, will entirely displace traditional publications.Chris Anderson, the former editor-in-chief ofWired, wrote inNature that the "wisdom of crowds" approach of Wikipedia will not displace topscientific journals with rigorouspeer review processes.[313]
Wikipedia's influence on the biography publishing business has been a concern for some. Book publishing data tracker NielsenBookScan stated in 2013 that biography sales were dropping "far more sharply".[314]Kathryn Hughes, professor oflife writing at theUniversity of East Anglia and author of two biographies wrote, "The worry is that, if you can get all that information from Wikipedia, what's left for biography?"[314]
In 2015, French researchers José Lages of theUniversity of Franche-Comté inBesançon and Dima Shepelyansky ofPaul Sabatier University inToulouse published a global university ranking based on Wikipedia scholarly citations.[320][321][322] They usedPageRank,CheiRank and similar algorithms "followed by the number of appearances in the 24 different language editions of Wikipedia (descending order) and the century in which they were founded (ascending order)".[322][323] The study was updated in 2019.[324]
In December 2015,John Julius Norwich stated, in a letter published inThe Times newspaper, that as a historian he resorted to Wikipedia "at least a dozen times a day", and had never yet caught it out. He described it as "a work of reference as useful as any in existence", with so wide a range that it is almost impossible to find a person, place, or thing that it has left uncovered and that he could never have written his last two books without it.[325]
A 2017MIT study suggests that words used in Wikipedia articles end up in scientific publications.[326] Studies related to Wikipedia have been usingmachine learning andartificial intelligence[286] to support various operations. One of the most important areas is the automatic detection of vandalism[327][328] anddata quality assessment in Wikipedia.[329][330]
Several interactive multimedia encyclopedias incorporating entries written by the public existed long before Wikipedia was founded. The first of these was the 1986BBC Domesday Project, which included text (entered onBBC Micro computers) and photographs from more than a million contributors in the UK, and covered the geography, art, and culture of the UK. This was the first interactive multimedia encyclopedia (and was also the first major multimedia document connected through internal links), with the majority of articles being accessible through an interactive map of the UK. The user interface and part of the content of the Domesday Project were emulated on a website until 2008.[332]
Several free-content, collaborative encyclopedias were created around the same period as Wikipedia (e.g.Everything2),[333] with many later being merged into the project (e.g.GNE).[W 130] One of the most successful early online encyclopedias incorporating entries by the public wash2g2, which was created byDouglas Adams in 1999. The h2g2 encyclopedia is relatively lighthearted, focusing on articles which are both witty and informative.[334]
^Meyers, Peter (September 20, 2001)."Fact-Driven? Collegial? This Site Wants You".The New York Times. RetrievedNovember 22, 2007.'I can start an article that will consist of one paragraph, and then a real expert will come along and add three paragraphs and clean up my one paragraph,' said Larry Sanger of Las Vegas, who founded Wikipedia with Mr. Wales.
^Gibbons, Austin; Vetrano, David; Biancani, Susan (2012)."Wikipedia: Nowhere to grow"(PDF). Stanford Network Analysis Project.Archived(PDF) from the original on July 18, 2014.
^abKleinz, Torsten (February 2005)."World of Knowledge"(PDF).Linux Magazine. Archived fromthe original(PDF) on September 25, 2007. RetrievedJuly 13, 2007.The Wikipedia's open structure makes it a target for trolls and vandals who malevolently add incorrect information to articles, get other people tied up in endless discussions, and generally do everything to draw attention to themselves.
^West, Andrew G.; Chang, Jian; Venkatasubramanian, Krishna; Sokolsky, Oleg; Lee, Insup (2011)."Link Spamming Wikipedia for Profit".Proceedings of the 8th Annual Collaboration, Electronic messaging, Anti-Abuse and Spam Conference on – CEAS '11. 8th Annual Collaboration, Electronic Messaging, Anti-Abuse, and Spam Conference. pp. 152–161.CiteSeerX10.1.1.222.7963.doi:10.1145/2030376.2030394.ISBN978-1-4503-0788-8.Archived from the original on April 14, 2021. RetrievedMarch 26, 2021.
^Priedhorsky, Reid; Chen, Jilin; Shyong (Tony) K. Lam; Panciera, Katherine; Terveen, Loren; Riedl, John (November 4, 2007)."Creating, Destroying, and Restoring Value in Wikipedia"(PDF).Association for Computing Machinery Group '07 Conference Proceedings; GroupLens Research, Department of Computer Science and Engineering, University of Minnesota.CiteSeerX10.1.1.123.7456. Archived fromthe original(PDF) on October 25, 2007. RetrievedOctober 13, 2007.
^Kalyanasundaram, Arun; Wei, Wei; Carley, Kathleen M.; Herbsleb, James D. (December 2015). "An agent-based model of edit wars in Wikipedia: How and when is consensus reached".2015 Winter Simulation Conference (WSC). Huntington Beach, CA: IEEE. pp. 276–287.CiteSeerX10.1.1.715.2758.doi:10.1109/WSC.2015.7408171.ISBN978-1-4673-9743-8.S2CID9353425.
^Suh, Bongwon; Convertino, Gregorio; Chi, Ed H.; Pirolli, Peter (2009). "The singularity is not near".Proceedings of the 5th International Symposium on Wikis and Open Collaboration. Orlando, FL: ACM Press. pp. 1–10.doi:10.1145/1641309.1641322.ISBN978-1-60558-730-1.
^Bear, Julia B.; Collier, Benjamin (March 2016). "Where are the Women in Wikipedia? Understanding the Different Psychological Experiences of Men and Women in Wikipedia".Sex Roles.74 (5–6):254–265.doi:10.1007/s11199-015-0573-y.S2CID146452625.
^Goodwin, Jean (2009)."The Authority of Wikipedia"(PDF). Archived fromthe original(PDF) on November 22, 2009. RetrievedJanuary 31, 2011.Wikipedia's commitment to anonymity/pseudonymity thus imposes a sort of epistemic agnosticism on its readers
^Kittur, Aniket (2007). "Power of the Few vs. Wisdom of the Crowd: Wikipedia and the Rise of the Bourgeoisie".CHI '07: Proceedings of the SIGCHI Conference on Human Factors in Computing Systems. Viktoria Institute.CiteSeerX10.1.1.212.8218.
^abGoldman, Eric (2010)."Wikipedia's Labor Squeeze and its Consequences".Journal on Telecommunications and High Technology Law.8.Archived from the original on January 26, 2023. RetrievedJanuary 26, 2023 – via Santa Clara Law Digital Commons.
^abKessenides, Dimitra; Chafkin, Max (December 22, 2016)."Is Wikipedia Woke?".Bloomberg Businessweek.Archived from the original on April 15, 2022. RetrievedSeptember 21, 2022.
^Viégas, Fernanda B. (January 3, 2007)."The Visual Side of Wikipedia"(PDF).Visual Communication Lab, IBM Research. Archived fromthe original(PDF) on October 24, 2006. RetrievedOctober 30, 2007.
^"Wikipedia Bias".StosselTV. April 27, 2022.Archived from the original on December 9, 2022. RetrievedJanuary 29, 2023.
^Hube, Christoph (2017). "Bias in Wikipedia".Proceedings of the 26th International Conference on World Wide Web Companion – WWW '17 Companion. New York, New York, US: ACM Press. pp. 717–721.doi:10.1145/3041021.3053375.ISBN978-1-4503-4914-7.
^Morris-O'Connor, Danielle A., Andreas Strotmann, and Dangzhi Zhao. "The colonization of Wikipedia: evidence from characteristic editing behaviors of warring camps." Journal of Documentation 79.3 (2023): 784-810.
^Lam, Shyong (Tony) K.; Uduwage, Anuradha; Dong, Zhenhua; Sen, Shilad; Musicant, David R.; Terveen, Loren; Riedl, John (October 3–5, 2011).WP:Clubhouse? An Exploration of Wikipedia's Gender Imbalance(PDF). WikiSym'2011. Mountain View, California: ACM.Archived(PDF) from the original on March 9, 2021. RetrievedMarch 26, 2021.
^Strohmaier, Markus (March 6, 2017). "KAT50 Society, Culture".Multilingual historical narratives on Wikipedia.GESIS – Leibniz Institute for the Social Sciences.doi:10.7802/1411.Archived from the original on January 31, 2023. RetrievedJanuary 31, 2023.Wikipedia narratives about national histories (i) are skewed towards more recent events (recency bias) and (ii) are distributed unevenly across the continents with significant focus on the history of European countries (Eurocentric bias).
^abHube, Christoph (April 3, 2017)."Bias in Wikipedia".Proceedings of the 26th International Conference on World Wide Web Companion – WWW '17 Companion. Republic and Canton of Geneva, CHE: International World Wide Web Conferences Steering Committee. pp. 717–721.doi:10.1145/3041021.3053375.ISBN978-1-4503-4914-7.S2CID10472970.
^Bizer, Christian; Lehmann, Jens; Kobilarov, Georgi; Auer, Sören; Becker, Christian; Cyganiak, Richard; Hellmann, Sebastian (September 2009). "DBpedia – A crystallization point for the Web of Data".Journal of Web Semantics.7 (3):154–165.CiteSeerX10.1.1.150.4898.doi:10.1016/j.websem.2009.07.002.S2CID16081721.
^abcLih, Andrew (June 20, 2015)."Can Wikipedia Survive?".The New York Times.Archived from the original on February 17, 2022. RetrievedFebruary 3, 2023.
^Rainie, Lee; Tancer, Bill (December 15, 2007)."Wikipedia users"(PDF).Pew Internet & American Life Project. Pew Research Center. Archived fromthe original(PDF) on March 6, 2008. RetrievedDecember 15, 2007.36% of online American adults consult Wikipedia. It is particularly popular with the well-educated and current college-age students.
^Arias, Martha L. (January 29, 2007)."Wikipedia: The Free Online Encyclopedia and its Use as Court Source".Internet Business Law Services. Archived fromthe original on May 20, 2012. RetrievedDecember 26, 2008. (The name "World Intellectual Property Office" should however read "World Intellectual Property Organization" in this source.)
^Lexington (September 24, 2011)."Classlessness in America: The uses and abuses of an enduring myth".The Economist. RetrievedSeptember 27, 2011.Socialist Labour Party of America [...] though it can trace its history as far back as 1876, when it was known as the Workingmen's Party, no less an authority than Wikipedia pronounces it "moribund".
^Luyt, Brendan (January 1, 2020). "A new kind of travel guide or more of the same? Wikivoyage and Cambodia".Online Information Review.45 (2):356–371.doi:10.1108/OIR-03-2020-0104.
^Caldwell, Christopher (June 14, 2013)."A chapter in the Enlightenment closes".Financial Times.Archived from the original on December 25, 2022. RetrievedJune 15, 2013.Bertelsmann did not resort to euphemism this week when it announced the end of the Brockhaus encyclopedia brand. Brockhaus had been publishing reference books for two centuries when the media group bought it in 2008. [...] The internet has finished off Brockhaus altogether. [...] What Germans like is Wikipedia.
^"All hail Wikipedia".www.thetimes.com. December 13, 2015. RetrievedOctober 1, 2024.
^Thompson, Neil; Hanley, Douglas (February 13, 2018). "Science Is Shaped by Wikipedia: Evidence From a Randomized Control Trial".MIT Sloan Research Paper No. 5238-17. Rochester, NY.doi:10.2139/ssrn.3039505.S2CID30918097.SSRN3039505 – viaSSRN.
^Sarabadani, Amir;Halfaker, Aaron; Taraborelli, Dario (April 2017). "Proceedings of the 26th International Conference on World Wide Web Companion – WWW '17 Companion".WWW '17 Companion: Proceedings of the 26th International Conference on World Wide Web Companion. International Conference on World Wide Web Companion. Perth; New York:Association for Computing Machinery. pp. 1647–1654.arXiv:1703.03861.doi:10.1145/3041021.3053366.ISBN978-1-4503-4914-7.
^Potthast, Martin; Stein, Benno; Gerling, Robert (2008). "Advances in Information Retrieval". In Macdonald, Craig; Ounis, Iadh; Plachouras, Vassilis; Ruthven, Ian; White, Ryen W. (eds.).Advances in Information Retrieval. 30thECIR. Lecture Notes in Computer Science. Vol. 4956. Glasgow: Springer. pp. 663–668.CiteSeerX10.1.1.188.1093.doi:10.1007/978-3-540-78646-7_75.ISBN978-3-540-78645-0.
^abBirken, P. (December 14, 2008)."Bericht Gesichtete Versionen".Wikide-l (Mailing list) (in German). Wikimedia Foundation.Archived from the original on June 22, 2014. RetrievedFebruary 15, 2009.
^abWikipedia:Citing sources: "Wikipedia's verifiability policy requires inline citations for any material challenged or likely to be challenged, and for all quotations, anywhere in article space."
^No original research. February 13, 2008. "Wikipedia does not publish original thought."
^Wikipedia:No original research: "Wikipedia articles must not contain original research. The phrase "original research"... is used on Wikipedia to refer to material—such as facts, allegations, and ideas—for which no reliable, published sources exist."
^Wikipedia:Verifiability: "Readers must be able to check that any of the information within Wikipedia articles is not just made up. This means all material must be attributable to reliable, published sources. Additionally, quotations and any material challenged or likely to be challenged must be supported by inline citations."
^Neutral point of view. February 13, 2008. "All Wikipedia articles and other encyclopedic content must be written from a neutral point of view, representing significant views fairly, proportionately and without bias."
^Sanger, Larry (December 31, 2004)."Why Wikipedia Must Jettison Its Anti-Elitism".Kuro5hin, Op–Ed. Archived fromthe original on November 1, 2021. RetrievedMarch 26, 2021.There is a certain mindset associated with unmoderated Usenet groups [...] that infects the collectively-managed Wikipedia project: if you react strongly to trolling, that reflects poorly on you, not (necessarily) on the troll. If you [...] demand that something be done about constant disruption by trollish behavior, the other listmembers will cry "censorship", attack you, and even come to the defense of the troll. [...] The root problem: anti-elitism, or lack of respect for expertise. There is a deeper problem [...] which explains both of the above-elaborated problems. Namely, as a community, Wikipedia lacks the habit or tradition of respect for expertise. As a community, far from being elitist, it is anti-elitist (which, in this context, means that expertise is not accorded any special respect, and snubs and disrespect of expertise are tolerated). This is one of my failures: a policy that I attempted to institute in Wikipedia's first year, but for which I did not muster adequate support, was the policy of respecting and deferring politely to experts. (Those who were there will, I hope, remember that I tried very hard.)
^Wales, Jimmy (March 8, 2003)."Wikipedia is an encyclopedia".Wikipedia-l (Mailing list).Archived from the original on July 10, 2017. RetrievedJanuary 27, 2023.
^"Meta-Wiki". Wikimedia Foundation.Archived from the original on July 14, 2013. RetrievedMarch 24, 2009.
^Vermeir, Walter (December 1, 2007)."Resolution:License update".Wikimedia Foundation.Archived from the original on September 3, 2011. RetrievedDecember 4, 2007.
Runciman, David (May 28, 2009)."Like Boiling a Frog".London Review of Books. Archived fromthe original on May 27, 2009. RetrievedJune 3, 2009.
Stix, Gary, "Wiki-Curious: Are you a 'busybody,' a 'hunter" or a 'dancer'?",Scientific American, vol. 332, no. 2 (February 2025), p. 18. "'Curiosity actually works by connecting pieces of information, not just acquiring them.'"
Wales, Jimmy (December 9, 2016)."How Wikipedia Works".Cato Institute.Jimmy Wales, founder of Wikipedia, discusses the site, how it's treated by governments, and how it's fueled by its users.
Goldman, Eric (2010). "Wikipedia's Labor Squeeze and its Consequences".Journal of Telecommunications and High Technology Law.8.SSRN1458162. (A blog post by the author.)
Rijshouwer, Emiel (2019).Organizing Democracy. Power concentration and self-organization in the evolution of Wikipedia (PhD, Erasmus University Rotterdam). Rijksuniversiteit Groningen.hdl:1765/113937.ISBN978-94-028-1371-5.OCLC1081174169. (Open access)
Halfaker, Aaron; R. Stuart Geiger; Morgan, Jonathan T.; Riedl, John (2012). "The Rise and Decline of an Open Collaboration Community".American Behavioral Scientist.57 (5): 664.doi:10.1177/0002764212469365.S2CID144208941.
Listen to:Keen, Andrew (June 16, 2007)."Does the Internet Undermine Culture?".National Public Radio, US. The NPR interview with A. Keen, Weekend Edition Saturday, June 16, 2007.
Bruckman, Amy S. (2022).Should You Believe Wikipedia?: Online Communities and the Construction of Knowledge. Cambridge University Press.doi:10.1017/9781108780704.ISBN978-1-108-78070-4.
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