Facebook CEO Mark Zuckerberg speaks during a conference at the Mobile World Congress, the world's largest mobile phone trade show in Barcelona, Spain, in this March 2, 2015, file photo. (AP Photo/Manu Fernandez, File)
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Facebook CEO Mark Zuckerberg speaks during a conference at the Mobile World Congress, the world's largest mobile phone trade show in Barcelona, Spain, in this March 2, 2015, file photo. (AP Photo/Manu Fernandez, File)
