FILE - In this Nov. 16, 2010 file photo, Facebook CEO Mark Zuckerberg smiles as he speaks at the Web 2.0 Summit in San Francisco. Facebook, the social network that changed "friend" from
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more  FILE - In this Nov. 16, 2010 file photo, Facebook CEO Mark Zuckerberg smiles as he speaks at the Web 2.0 Summit in San Francisco. Facebook, the social network that changed "friend" from a noun to a verb, is expected to file as early as Wednesday to sell stock on the open market. Its debut is likely to be the most talked-about initial public offering since Google in 2004. (AP Photo/Paul Sakuma, File) less 
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