This is technically feasible, and bussiness don't need to know your id. If anonymous government certificates are issued.
But I'm morally against it. We need to both educate on the dangers of internet and truly control harmful platforms.
But just locking it is bad for ociety. What happens with kids in shitty families that find in social media (not Facebook, think prime time Tumblr) a way to scape and find that there are people out there not as shitty as their family. Now they are just completely locked to their shitty family until it's too late.