A Facebook worker waits for friends to arrive outside of Facebook headquarters in Menlo Park, Calif., Friday, Aug. 17, 2012. Facebook stock is trading at $19 and has lost half its market value since its May public offering. (AP Photo/Paul Sakuma)

Associated Press
A Facebook worker waits for friends to arrive outside of Facebook headquarters in Menlo Park, Calif., Friday, Aug. 17, 2012. Facebook stock is trading at $19 and has lost half its market value since its May public offering. (AP Photo/Paul Sakuma)
A Facebook worker waits for friends to arrive outside of Facebook headquarters in Menlo Park, Calif., Friday, Aug. 17, 2012. Facebook stock is trading at $19 and has lost half its market value since its May public offering. (AP Photo/Paul Sakuma)
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