Facebook is a social network service and website launched in February 2004 that is operated and privately owned by Facebook, Inc.[1] As of July 2010 Facebook has more than 500 million active users,[6] which is about one person for every fourteen in the world.[7][N 1] Users 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.
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