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Facebook CEO Mark Zuckerberg participates in an online "town hall" at Facebook headquarters in Palo Alto, California
Facebook CEO Mark Zuckerberg participates in an online "town hall" meeting with President Barak Obama at Facebook headquarters in Palo Alto, California on April 20, 2011. UPI/Terry Schmitt
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Facebook is a social networking service and Web site launched in February 2004, operated and privately owned by Facebook, Inc.[1] As of July 2011[update], Facebook has more than 800 million active users.[6] 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, and categorize their friends into lists such as "People From Work" or "Really Good Friends". The name of the service stems from the colloquial name for the book given to students at the start of the academic year by some university administrations in the United States to help students get to know each other. Facebook allows any users who declare themselves to be at least 13 years old to become registered users of the site.

This article is licensed under the GNU Free Documentation License.
It uses material from the Wikipedia article "Facebook ."
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