** FILE ** Facebook CEO Mark Zuckerberg talks about the social network site's new privacy settings in May 2010 in Palo Alto, Calif. (AP Photo/Marcio Jose Sanchez, File)
** FILE ** In this Thursday, March 20, 2013, photo, Facebook CEO Mark Zuckerberg speaks at Facebook headquarters in Menlo Park, Calif. A research firm expects Facebook’s mobile ad revenue to soar this year, hitting nearly $1 billion a year after the company started to splice ads into its users’ mobile phones and tablets. (AP Photo/Jeff Chiu)
** FILE ** In this Thursday, March 20, 2013, photo, Facebook CEO Mark Zuckerberg speaks at Facebook headquarters in Menlo Park, Calif. A research firm expects Facebook’s mobile ad revenue to soar this year, hitting nearly $1 billion a year after the company started to splice ads into its users’ mobile phones and tablets. (AP Photo/Jeff Chiu)
** FILE ** Facebook CEO Mark Zuckerberg speaks during a "fireside chat" at a conference organized by technology blog TechCrunch in San Francisco on Tuesday, Sept. 11, 2012. Mr. Zuckerberg updated his Facebook status on Thursday, Oct. 4, 2012, to announce that the social networking site has more than 1 billion active users each month. (AP Photo/Eric Risberg)
Facebook CEO Mark Zuckerberg speaks at company headquarters in Menlo Park, Calif., on Thursday, March 7, 2013. Mr. Zuckerberg unveiled a new look for the social network's News Feed, the place where its 1 billion users congregate to see what's happening with their friends, family and favorite businesses. (AP Photo/Jeff Chiu)
Facebook CEO Mark Zuckerberg speaks at company headquarters in Menlo Park, Calif., on Thursday, March 7, 2013. Mr. Zuckerberg unveiled a new look for the social network's News Feed, the place where its 1 billion users congregate to see what's happening with their friends, family and favorite businesses. (AP Photo/Jeff Chiu)
** FILE ** Facebook CEO Mark Zuckerberg speaks during a "fireside chat" at a conference organized by technology blog TechCrunch in San Francisco on Tuesday, Sept. 11, 2012. Mr. Zuckerberg updated his Facebook status on Thursday, Oct. 4, 2012, to announce that the social networking site has more than 1 billion active users each month. (AP Photo/Eric Risberg)
**FILE** Facebook CEO Mark Zuckerberg is seen Oct. 15, 2011, during a meeting in San Francisco. (Associated Press)
**FILE** Facebook CEO Mark Zuckerberg is seen Oct. 15, 2011, during a meeting in San Francisco. (Associated Press)
