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Mark Zuckerberg: Could He Lose Facebook?

CEO "unsure" whether he signed contract giving it away.

Well this could get interesting: Lawyers for Facebook CEO Mark Zuckerberg say they're "unsure" whether their client signed a contract in April 2003 giving a man named Paul Ceglia 84 percent of the company. "Whether he signed this piece of paper, we're unsure at this moment," Facebook lawyer Lisa Simpson told a U.S. District Court judge on Tuesday. Simpson said that "Mr. Zuckerberg did have a contract with Mr. Ceglia," but that there are also "serious questions" about the authenticity of Ceglia's document, which refers to "The Face Book" and was signed nine months before Zuckerberg launched the social network. Facebook is estimated to be worth about $25 billion.