FILE - In this April 10, 2018, file photo, Facebook CEO Mark Zuckerberg returns from a break as he testifies before a joint hearing of the Commerce and Judiciary Committees on Capitol Hill in Washington. The U.S. Justice Department and the Federal Trade Commission are moving to investigate Google, Facebook, Amazon and Apple over their aggressive business practices, and the House Judiciary Committee has announced an antitrust probe of unidentified technology companies. (AP Photo/Andrew Harnik, File)