Facebook CEO Zuckerberg smiles in the stage before delivering a keynote speech during the Mobile World Congress in Barcelona

Reuters
Facebook CEO Zuckerberg smiles in the stage before delivering a keynote speech during the Mobile World Congress in Barcelona
Facebook Chief Executive Officer Mark Zuckerberg smiles in the stage before delivering a keynote speech during the Mobile World Congress in Barcelona February 24, 2014. REUTERS/Albert Gea
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