WASHINGTON, DC – APRIL 10: Facebook co-founder, Chairman and CEO Mark Zuckerberg returns to the witness table after taking a brief break while testifying before a combined Senate Judiciary and Commerce committee hearing in the Hart Senate Office Building on Capitol Hill April 10, 2018 in Washington, DC. Zuckerberg, 33, was called to testify after it was reported that 87 million Facebook users had their personal information harvested by Cambridge Analytica, a British political consulting firm linked to the Trump campaign. (Photo by Alex Wong/Getty Images)