Photo: Facebook CEO Mark Zuckerberg listens to a question from the audience after unveiling a new messaging system during a news conference in San Francisco, California November 15, 2010.    REUTERS/Robert Galbraith
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Facebook CEO Mark Zuckerberg listens to a question from the audience after unveiling a new messaging system during a news conference in San Francisco, California November 15, 2010. REUTERS/Robert Galbraith
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