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Facebook CEO Mark Zuckerberg introduces a new messenger platform at the F8 summit in San Francisco, California, on March 25, 2015. AFP PHOTO/JOSH EDELSON (Photo credit should read Josh Edelson/AFP/Getty Images)

Facebook CEO Mark Zuckerberg introduces a new messenger platform at the F8 summit in San Francisco, California, on March 25, 2015. AFP PHOTO/JOSH EDELSON        (Photo credit should read Josh Edelson/AFP/Getty Images)