FILE PHOTO: Facebook CEO Mark Zuckerberg testifies remotely via videoconference in this screengrab made from video during a Senate Judiciary Committee hearing titled, "Breaking the News: Censorship, Suppression, and the 2020 Election,? on Facebook and Twitter's content moderation practices, on Capitol Hill in Washington, U.S., November 17, 2020. U.S. Senate Judiciary Committee via REUTERS/File Photo/File Photo
(Reuters) - Four Republican U.S. lawmakers requested on Tuesday that Facebook Inc, Twitter Inc and Alphabet Inc's Google turn over any studies they have done on how their services affect children's mental health.
The request follows a joint hearing last week of two House Energy and Commerce subcommittees at which the companies' chief executives discussed their content moderation practices in the wake of the siege on the Capitol in January.
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