WASHINGTON (AP) — Bearing down on hugely popular social media platforms and their impact on children, the leaders of a Senate panel have called executives from YouTube, TikTok and Snapchat to face questions on what their companies are doing to ensure young users’ safety.

The Senate Commerce subcommittee on consumer protection is fresh off a highly charged hearing with a former Facebook data scientist, who laid out internal company research showing that the company’s Instagram photo-sharing service appears to seriously harm some teens.

The panel is widening its focus to examine other tech platforms, with millions or billions of users, that also compete for young people’s attention and loyalty.

The three executives — Michael Beckerman, a TikTok vice president and head of public policy for the Americas; Leslie Miller, vice president for government affairs and public policy of YouTube’s owner Google; and Jennifer Stout, vice president for global public policy of Snapchat parent Snap Inc. — are due to appear at a subcommittee hearing Tuesday.