Facebook CEO Mark Zuckerberg participates in an online "town hall" at Facebook headquarters in Palo Alto, California

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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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