FOR USE AS DESIRED, YEAR END PHOTOS - FILE - FILE - In this May 18, 2012 file photo provided by Facebook, Facebook founder, Chairman and CEO Mark Zuckerberg, center, rings the Nasdaq opening bell from Facebook headquarters in Menlo Park, Calif. Robert Greifeld, second from right, CEO of the Nasdaq-OMX Stock Market, Inc. The social media company had its IPO. (AP Photo/Nasdaq via Facebook, Zef Nikolla, File)

Associated Press
FOR USE AS DESIRED, YEAR END PHOTOS - FILE - FILE - In this May 18, 2012 file photo provided by Facebook, Facebook founder, Chairman and CEO Mark Zuckerberg, center, rings the Nasdaq opening bell from Facebook headquarters in Menlo Park, Calif. Robert Greifeld, second from right, CEO of the Nasdaq-OMX Stock Market, Inc. The social media company had its IPO. (AP Photo/Nasdaq via Facebook, Zef Nikolla, File)
FOR USE AS DESIRED, YEAR END PHOTOS - FILE - FILE - In this May 18, 2012 file photo provided by Facebook, Facebook founder, Chairman and CEO Mark Zuckerberg, center, rings the Nasdaq opening bell from Facebook headquarters in Menlo Park, Calif. Robert Greifeld, second from right, CEO of the Nasdaq-OMX Stock Market, Inc. The social media company had its IPO. (AP Photo/Nasdaq via Facebook, Zef Nikolla, File)
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