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Mark Zuckerberg Tells Senate: Election Security Is An 'Arms Race'

Facebook CEO Mark Zuckerberg testifies before a joint hearing of the U.S. Senate Commerce, Science and Transportation Committee and Senate Judiciary Committee on Capitol Hill in Washington, D.C., on Tuesday. (AFP/Getty Images)
Facebook CEO Mark Zuckerberg testifies before a joint hearing of the U.S. Senate Commerce, Science and Transportation Committee and Senate Judiciary Committee on Capitol Hill in Washington, D.C., on Tuesday. (AFP/Getty Images)

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