Surgeon General warns of "profound" risks of social media for children and teens.

The US surgeon general has issued an advisory warning of the "profound risk of harm" posed by social media use by children and teenagers to their mental health and wellbeing. The advisory calls on tech companies, policymakers, and parents to take immediate action to protect kids. The report shows how current controls on access by children are not working, with almost 40% of eight- to 12-year-olds being regular users. The surgeon general's warning came as the White House put out its own notice on Tuesday about what it called the "unprecedented youth mental health crisis" in the US.