The chief executives of Facebook and Twitter testified before a congressional hearing on Tuesday that questioned their content moderation practices as Republicans accuse social media companies of censoring conservative speech.
In October, Republican lawmakers on the U.S.
Senate Judiciary committee voted unanimously to approve formal summons for Facebook's Mark Zuckerberg and Twitter's Jack Dorsey.
Democrats on the panel did not vote on the subpoena.
The subpoenas were approved right after the social media platforms.