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On Tuesday, four Republican lawmakers asked Facebook, Twitter and Google to hand over any studies they have conducted on how their services affect children's mental health.
This follows a House Energy and Commerce subcommittee hearing last week in which top company executives discussed their content moderation practices. siege of the Capitol in January.
This was reported by the Reuters news agency, which added that Representative Cathy McMorris Rodgers, the top Republican on the committee, asked the CEOs of the technology companies at the hearing whether their firms had conducted internal research into children's mental health.
Facebook CEO Mark Zuckerberg said at the time that he believed the company had conducted such research, while Twitter's Jack Dorsey said that no such studies were available.
For his part, Google CEO Sundar Pichai said that the company consulted with external experts and invested