What is “social media”?
What do you actually want to ban?
Does Github count?
Does an anorexia-support forum count?
Does a queer-support forum count?
Does the schools own homework-submission system count?
Does Whatsapp, which the kids use to talk to family and to bully each other?
How about Telegram that the kids use to talk to their drug dealers?
How is it different?
Are we really saying nobody under 18 can watch youtube, and expecting that to make life better for those kids rather than worse?
How are you going to define ‘social media’ such that you’ll ban the harm you think you see without also banning any chance of support for a person looking to learn to program, or cope with their abusive parents, or seek advice about being anorexic or queer?
Is it really a good idea to attach a label to every child account for all the websites they visit? You want the kids to all have a big “Child” tag on them as they wonder the net? Might that not increase rather than decrease their vulnerability?