Webmention is aW3C recommendation that describes a simple protocol to notify any URL when a websitelinks to it, and for web pages to request notifications when somebody links to them.^[1] Webmention was originally developed in theIndieWebCamp community^[2] and published as aW3C working draft on January 12, 2016.^[3] As of January 12, 2017 it is a W3C recommendation.^[4] Webmention enables authors to keep track of who is linking to, referring to, or commenting on their articles. By incorporating such comments from other sites, sites themselves providefederated commenting functionality.

Similar topingback, Webmention is one of four types oflinkbacks, but was designed to be simpler than theXML-RPC protocol thatpingback relies upon, by instead only usingHTTP and x-www-urlencoded content.^[2] Beyond previous linkback protocols, Webmention also specifies protocol details for when a page that is the source of a link is deleted, or updated with new links or removal of existing links.

• Pingback, theXML-RPC based protocol that Webmention was modeled after.
• Refback, a similar protocol but easier than Pingbacks since the site originating the link doesn't have to be capable of sending a Pingback request.
• Trackback, a similar protocol but more prone toSping (Trackback spam) since there is no authentication or verification possible with Trackbacks.

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