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Facebook Connect is a set of application programming interfaces (APIs) launched by Facebook in 2008 that enabled users to log on to third-party websites, applications or devices using their Facebook identity.
Facebook Connect is a way for Web or application developers to help their users to connect and share content with their friends, both on and off Facebook. This can increase a site or application's interaction with its users.
The most common example of Facebook Connect is its use in commenting on Web content. Articles posted online often allow comments. When they do so through Facebook Connect, the Facebook user's comment is also posted to his or her news feed (and therefore sent to all the user's friends). The comment also shows the user's name and profile picture on the website where the article appears. This function has been adopted by many online publishers because when posters are forced to act under a verifiable identity, this can help reduce hateful, violent or spam comments.
Facebook Connect provides the following functionalities: