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How will Zuckerberg's congressional hearing stack up to other high-profile testimonies?

James Comey's 2017 hearing was nearly three hours long. Anita Hill's 1991 hearing was six hours. Hillary Clinton's 2015 hearing was 11 hours. Facebook CEO Mark Zuckerberg joins the list of high-profile people to testify before Congress, with two hearings scheduled for Tuesday and Wednesday.
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