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Congressional aides stand along a wall where Facebook CEO Mark Zuckerberg's face is visible on a mock "Zuck Buck" depicted on a screen as David Marcus, CEO of Facebook's Calibra digital wallet service, is questioned by Rep. Brad Sherman, D-Calif., during a House Financial Services Committee hearing on Facebook's proposed cryptocurrency on Capitol Hill in Washington, Wednesday, July 17, 2019. (AP Photo/Andrew Harnik)