Information Sharing in an Online Community Cross Reference to Related Application 100011 The present application is related to the following U.S. Patent Application, which is assigned to the assignee hereof and incorporated herein by reference in its entirety: U.S. patent application Ser. No. 12/195,332 (Attorney Docket No. 14093/4537), entitled Advertising in an Online Community, and filed concurrently herewith. Background Field of the Invention 100021 The present invention relates to online communities, and more particularly to information sharing in an online community. Description of Related Art 100031 The Internet has become a major platform for distributing and sharing information, and has been used for, e.g., online shopping, auction, photo album sharing and social networking. When using these services, users may search a website for goods, services or people they are interested in, e.g., an auction item, a hotel in a particular area or a classmate. Currently available systems mainly focus on interactions between parties with opposing purposes, e.g., a supplier and a consumer, or a buyer and a seller. Although a buyer may look at comments on products or services left previously by other buyers, there is no effective way for the buyer to directly communicate with other buyers. Summary 10003A] An aspect of the present invention provides a method for sharing information in an online community which has at least two users, the method comprising: receiving a first search request to search a website from a first user; obtaining search results matching the first search request; enabling the search results to be displayed on a screen of the first user; determining a second user who searches the website with a second search request having a scope that at least partly overlaps the scope of the first search request; determining the second user has agreed to share information with the first user; and enabling a representation of the second user to be displayed on the screen of the first user in addition to the search results in response to the second search request having a scope that at least partly overlaps the scope of the first search request. 7256135 1 1 10003B] Another aspect of the present invention provides a system for information sharing in an online community which has at least two users, the system comprising: a server which runs a website and is coupled to a computer network; and a database; wherein the server: receives a first search request to search the website from a first user; obtains search results matching the first search request; enables the search results to be displayed on a screen of the first user; determines a second user who searches the website with a second search request having a scope that at least partly overlaps the scope of the first search request; determines the second user has agreed to share information with the first user; and enables a representation of the second user to be displayed on the screen of the first user in addition to the search results in response to the second search request having a scope that at least partly overlaps the scope of the first search request. 10003C] Another aspect of the present invention provides a computer program product comprising a computer-readable medium having instructions which, when performed by a computer, perform a method for sharing information in an online community which has at least two users, the method comprising: receiving a first search request to search a website from a first user; obtaining search results matching the first search request; enabling the search results to be displayed on a screen of the first user; determining a second user who searches the website with a second search request having a scope that at least partly overlaps the scope of the first search request; determining the second user has agreed to share information with the first user; and enabling a representation of the second user to be displayed on the screen of the first user in addition to the search results in response to the second search request having a scope that at least partly overlaps the scope of the first search request. BRIEF DESCRIPTION OF THE DRAWING FIGURES [00041 Embodiments of the present invention are described herein with reference to the accompanying drawings, similar reference numbers being used to indicate functionally similar elements. 100051 Fig. 1 illustrates a system for sharing information in an online community according to one embodiment of the present invention. 100061 Fig. 2 illustrates a flowchart of a method for sharing information in an online community according to one embodiment of the present invention. 7256135_1 la WO 2010/021893 PCT/US2009/053601 [0007] Fig. 3 illustrates a flowchart of a method for sharing information in an online community according to one embodiment of the present invention. [0008] Fig. 4 illustrates a flowchart of a method for sharing information in an online community according to one embodiment of the present invention. [0009] Figs. 5A -5H illustrate screenshots of a method for sharing information in an online community according to one embodiment of the present invention. DETAILED DESCRIPTION [0010] Internet users may form one or more online communities based on their common search interests. For example, users looking for a hotel in downtown New York on a travel website may form an online community "downtown New York hotels," and users looking for a bag on an auction website may form an online community "bag" or "purse". A user looking for a product or service may make more informed and objective decisions if he can directly hear from other users looking for similar products or services. [0011] The present invention provides a method which may allow users, who are looking for similar products or services on a website and thus belong to an online community, to directly communicate with each other. The method may be used in eCommerce, e.g., online shopping or online auctions. The method may also be used in other contexts, such as social networking and online photo albums. The invention may be carried out by computer-executable instructions stored in a memory, such as program modules. Advantages of the present invention will become apparent from the following detailed description. [0012] Fig. 1 illustrates a system for sharing information in an online community according to one embodiment of the present invention. As shown, an Internet server 101 may communicate over a network 103 with a number of user terminals 102-1, 102-2, ... 102-n. The Internet server 101 may be a computer system and may control the operation of a website, which may provide a certain type of service, e.g., online shopping, online auction, social networking or online photo albums. The Internet server 101 may include one or more of a screen, an input device, a processing unit 1011, memory devices 1012, and a system bus coupling various components in the computer system. A community information sharing module may be stored in one of the memory devices 1012 for -2- WO 2010/021893 PCT/US2009/053601 controlling the processing unit 1011 to process information sharing in an online community, including but not limited to the processes shown in Figs. 2-4. [0013] The Internet server 101 may access a database 104 which may store data relevant to the service provided by the website, e.g., information about items to be sold, items to be auctioned, people in a social network or photos in online photo albums. The database 104 may also store information about users of the website, e.g., user names, graphical representations, browsing histories, etc. It should be understood that information about users may be stored in a separate database. [0014] The user terminals 102 may be personal computers, handheld or laptop devices, microprocessor-based systems, set top boxes, or programmable consumer electronics. Each user terminal may have a browser application configured to receive and display web pages, which may include text, graphics, multimedia, etc. The web pages may be based on, e.g., HyperText Markup Language (HTML) or extensible markup language (XML). [0015] Network connectivity may be wired or wireless, using one or more communications protocols, as will be known to those of ordinary skill in the art. [0016] Fig. 2 illustrates a flowchart of a method for sharing information among users of an auction website W according to one embodiment of the present invention. The method of Fig. 2 may be used by buyers to share information about auction items in a system shown in Fig. 1. A user A may have registered with the auction website W to use its services. During the registration, the user A may select his user name and graphic representation. Such information may be stored in the database 104. [0017] The user A may want to buy a bag, and may log into the auction website W at 201 and start browsing. Items to be auctioned on the website may be displayed on a web page, as shown in Fig. 5A. [0018] To get more quickly to the item he is interested in, at 202, the user A may press a button on the web page to display a category of items to be auctioned. A category 501 may be displayed on the web page the user A is looking at, as shown in Fig. 5B. The user A may navigate through the category to get to his target: the sub-category for bags. [0019] Alternatively, the user A may press another button on the web page to display a search box. A search box 502 may be displayed on the web page the users A is looking at, as shown in Fig. 5C. The user A may type the word "bag" in the search box. -3- WO 2010/021893 PCT/US2009/053601 [0020] At 203, the server 101 may search the database 104, fetch bags to be auctioned, and display the fetched bags on a screen. [0021] At 204, the server 101 may record in the database 104 that the user A is looking for bags, and may access data in the database 104 to determine whether there are other users who are also looking for bags. The server may determine that users B, C, D, E and F are also looking for bags. The server 101 may fetch information about users B, C, D, E and F, e.g., their user names and graphical representations. It should be understood that search requests from users B, C, D, E and F do not need to be exactly the same as the search request from the user A, and only need to have some overlap with the search request from the user A. For example, the user C may be searching for LV speedy, and the user D may be looking for tote. Since both LV speedy and tote belong to the larger group "bags," the server 101 may determine that users C and D are looking for bags, and regard them as members of the online community "bag." [0022] At 205, user names or graphical representations 503 of users B, C, D, E and F may be displayed on the screen that the user A is looking at, as shown in Fig. 5D. At the same time, the user name or graphical representation of the user A may be displayed on screens that the users B, C, D, E or F are looking at. [0023] If the user A is interested in sharing information with users B, C, D, E or F, he may click on the user name or graphical representation of that user at 206. [0024] At 207, an option menu may be displayed, so that the user A may select how to interact with a selected user, e.g., the user E. One option is to invite the user E to chat, so that users A and E can share information about bags. Another option is to ask the user E to share his browsing history about bags, e.g., the keywords the user E used, the brands the user E searched, etc. A further option is to ask the user E to accept the user A as a follower so that the user A can follow the user E to look at bags the user E is looking at. [0025] The user A may select one of the options at 208, 209 or 210, and server 101 may determine whether the user E has agreed to interact with the user A at 211. If the user E has rejected the user A's request, the user A may be so informed, and the process may return to 206 so that the user A may select another user to share information with. [0026] If the user A selects to chat with the user E at 208, and the user E has accepted the request at 210, the server 101 may build a communication channel between users A -4- WO 2010/021893 PCT/US2009/053601 and E at 212. In one embodiment, users A and E may enter a chat room at 213 and chat via a text message window 504 on the user A's screen, as shown in Fig. 5E. In another embodiment, users A and E may chat over an IP phone connection set up by the server 101. By communicating with users who are also looking for bags, the user A may get these users' opinions about a brand, a type of bag, or a store, and may make more informed and objective decisions. [0027] If the user A requests to share the user E's browsing history about bags at 209, and the user E has agreed at 211, the server 101 may fetch the user E's browsing record from the database 104 at 214, and display in a pop-up window on the user A's screen categories the user E has visited, keywords the user E has used, or the bags the user E has viewed at 215. As shown in Fig. 5F, the keywords that the user E has searched may be displayed in a balloon 505 and may include: LV, LV speedy. If the user A clicks on any of these keywords at 216, the process may return to 203, and the server 101 may fetch auction items matching the user E's keywords. In another embodiment, the server 101 may simply display auction items which are related to the categories or keywords the user E has used. The user A may have selected a too narrow sub-category, input a wrong keyword, missed a brand, or input too many keywords in the search box. By looking at the user E's browsing history, the user A may either broaden his search and look at more bags, or narrow his search and look at bags he may really like. [0028] If the user A selects to be a follower of the user E at 210, and the user E has agreed at 211, the server 101 may fetch the user E's real time browsing behavior at 217. At 218, the server 101 may display bags the user E is looking at in a pop-up window on the user A's screen. Since users A and E are both interested in bags, the user A may stop his own browsing and simply look at what the user E has looked at. In addition, the user E may be more experienced, and the user A may be able to look at items he himself could not find. The follower mode may stop if the user A asks to stop at 219 or the user E asks to stop at 220. The follower mode also may automatically stop if either the user A or the user E logs off the website W. The process may then return to 205. [0029] If the user A is happy with a bag displayed on his screen, he may click on it, and the bidding/buying process may start. -5- WO 2010/021893 PCT/US2009/053601 [0030] It should be understood that other processes may be used to make browsing easier. For example, the user A may drag the screen to the right to see new auction items, or drag the screen to the left to go back to auction items previously displayed. [0031] Fig. 3 illustrates a flowchart of a method for sharing information in an online community according to one embodiment of the present invention. The method of Fig. 3 may be used in the system shown in Fig. 1 by an administrator of an auction website to display reminders or announcements to users, and may be used together with the method shown in Fig. 2. [0032] After receiving the user A's search request at 202, which may include the category the user A is interested in or the keyword(s) he input, at 301, the server 101 may fetch a site announcement or reminder related to auction items the user A is looking at. The announcement or reminder may ask users to be careful about scams or fraud. [0033] At 302, the server 101 may display, in a pop-up window on the user A's screen, a link to the fetched announcement or reminder. [0034] If the user A clicks on the link at 303, the announcement or reminder 506 may be displayed at 304, as shown in Fig. 5G. [0035] In one embodiment, a user of the website W may enter into an agreement with an advertiser and agree to carry the advertiser's advertisement when he is browsing the website W. Consequently, the advertisement may be displayed on screens shown in Figs. 5D-5H together with the user's user name or graphical representation. The method for enabling a user to carry an advertisement and displaying the advertisement is described in the co-pending U.S. patent application Ser. No. 12/ (Attorney Docket No. 14093/4537), entitled Advertising in an Online Community, which is incorporated herein by reference in its entirety. [0036] Fig. 4 illustrates a flowchart of a method for displaying targeted advertisements in an online community according to one embodiment of the present invention. The method shown in Fig. 4 may be used in the system shown in Fig. 1 and may be used together with the method shown in Fig. 2. [0037] Advertisers may enter into agreements with the website W to have their advertisements displayed on web pages of the website W. Information about the advertisers, their advertisements and their contract terms with the website W may be -6- WO 2010/021893 PCT/US2009/053601 stored in the database 104. It should be understood that such information may be stored in a separate database as well. [0038] After receiving the user A's search request at 202, which may include the category the user A is interested in or the keyword(s) he input, at 401, the server 101 may search the database 104 to find out whether there are advertisements related to the category or keywords, and if yes, fetch the advertisements. [0039] At 402, a link to a fetched advertisement may be displayed on the user A's screen. [0040] If the user A clicks on the link at 403, the advertisement 507 may be displayed at 404, as shown in Fig. 5H. [0041] Since the advertisement is related to category or keyword from the user A, it is more likely that the user A may be interested in the advertisement. [0042] Several features and aspects of the present invention have been illustrated and described in detail with reference to particular embodiments by way of example only, and not by way of limitation. Those of skill in the art will appreciate that alternative implementations and various modifications to the disclosed embodiments are within the scope and contemplation of the present disclosure. Therefore, it is intended that the invention be considered as limited only by the scope of the appended claims. -7-