Facebook CEO Mark Zuckerberg testifies during a Senate Commerce, Science and Transportation Committee and Senate Judiciary Committee. Jim Watson / AFP
Facebook CEO Mark Zuckerberg takes his seat to testify before the Senate Commerce, Science and Transportation Committee and the Senate Judiciary Committee joint hearing on 'Facebook, Social Media Privacy, and the Use and Abuse of Data' on Capitol Hill in Washington, DC, USA. Michael Reynolds / EPA
Facebook CEO Mark Zuckerberg takes his seat following a break in testifying before the Senate Commerce, Science and Transportation Committee and the Senate Judiciary Committee. Michael Reynolds / EPA
Facebook CEO Mark Zuckerberg speaks with Senator John Thune and Senator Chuck Grassley following a joint hearing of the Senate Commerce, Science and Transportation Committee and Senate Judiciary Committee. Brendan Smialowski / AFP
Facebook CEO Mark Zuckerberg departs after the hearing. Alex Brandon. AP Photo
Facebook CEO Mark Zuckerberg testifies before the Senate Commerce, Science and Transportation Committee and the Senate Judiciary Committee. Michael Reynolds / EPA
Facebook CEO Mark Zuckerberg testifies before the Senate Commerce, Science and Transportation Committee and the Senate Judiciary Committee. Shawn Thew / EPA
Facebook CEO Mark Zuckerberg testifies during a Senate Commerce, Science and Transportation Committee and Senate Judiciary Committee. Jim Watson / AFP
Facebook CEO Mark Zuckerberg takes his seat to testify before the Senate Commerce, Science and Transportation Committee and the Senate Judiciary Committee joint hearing on 'Facebook, Social Media Privacy, and the Use and Abuse of Data' on Capitol Hill in Washington, DC, USA. Michael Reynolds / EPA
Facebook CEO Mark Zuckerberg takes his seat following a break in testifying before the Senate Commerce, Science and Transportation Committee and the Senate Judiciary Committee. Michael Reynolds / EPA
Facebook CEO Mark Zuckerberg speaks with Senator John Thune and Senator Chuck Grassley following a joint hearing of the Senate Commerce, Science and Transportation Committee and Senate Judiciary Committee. Brendan Smialowski / AFP
Facebook CEO Mark Zuckerberg departs after the hearing. Alex Brandon. AP Photo
Facebook CEO Mark Zuckerberg testifies before the Senate Commerce, Science and Transportation Committee and the Senate Judiciary Committee. Michael Reynolds / EPA
Facebook CEO Mark Zuckerberg testifies before the Senate Commerce, Science and Transportation Committee and the Senate Judiciary Committee. Shawn Thew / EPA
Facebook CEO Mark Zuckerberg testifies during a Senate Commerce, Science and Transportation Committee and Senate Judiciary Committee. Jim Watson / AFP