File-This Oct. 23, 2019, file photo shows Facebook CEO Mark Zuckerberg testifying before a House Financial Services Committee hearing on Capitol Hill in Washington. Facebook’s stock dropped almost 3% in regular trading after news reports Thursday, Dec. 12, 2019, suggested that the FTC may take antitrust action to prevent Facebook from integrating its disparate messaging apps. The reports said the Federal Trade Commission may seek a court injunction that would block Facebook’s “interoperability” plans for Facebook Messenger, WhatsApp and Instagram, which involves revising them to use the same underlying software. (AP Photo/Andrew Harnik, File)