The chief executives of the world's biggest social media sites, such as Facebook, Instagram, and TikTok were on the hot seat on Capitol Hill, where U.S. Senators accused the tech titans of failing to protect children from abuse, exploitation, and bullying. Abigail Bimman reports on the hopes this will create social media safeguards; Meta CEO Mark Zuckerberg's apology to grieving parents; their reaction; and where Canada is at on regulating social media.