A group of social media bigwigs is set to be grilled by Congress on Wednesday about the risks their products pose to young people - yet again. The chief executives of Meta, TikTok, Snap, Discord and X, formerly known as Twitter, will testify before the Senate Judiciary Committee starting at 10 a.m. ET. Congress has done little to rein in the industry in recent years, even as consumer groups say social media puts young users at risk of everything from depression to bullying to sexual abuse.