Facebook is a social networking service and website launched in February 2004, operated and privately owned by Facebook, Inc. As of February 2012 [update], Facebook has more than 845 million active users. 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. Additionally, users may join common-interest user groups, organized by workplace, school or college, or other characteristics..... Source: Wikipedia

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