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FILE - In this Dec. 13, 2011 file photo, a sign with Facebook's "Like" logo is posted at Facebook headquarters near the FILE - In this Tuesday, April 18, 2017, file photo, conference workers speak in front of a demo booth at Facebook's annual F8 deve In this Wednesday, June 21, 2017, photo, Facebook CEO Mark Zuckerberg speaks at the Facebook Communities Summit, in Chicago, in ad