Facebook is a social networking service and website launched in February 2004, owned and operated by Facebook, Inc. As of May 2012, Facebook has over 900 million active users, more than half of them using Facebook on a mobile device. Users must register before using the site, after which they may create a personal profile, add other users as friends, and exchange messages, including automatic notifications when they update their profile.
Facebook Credits is a virtual currency that enables people to purchase items in games and non-gaming applications on the Facebook Platform. One U.S. dollar is the equivalent of 10 Facebook Credits. Facebook Credits are currently available in 15 currencies including U.S. dollars, pound sterling, euros, and Danish kroner. Eventually, it's expected Facebook will expand Credits into a micropaymentsystem open to any Facebook application, whether a game or a media company application.