Censorship is often justified by comparisons to physical substances like this - chemicals can irreparably harm your body, therefore ideas can irreparably harm your brain. I don't believe that these are the same. There's no way to really prove it, but there is a way to prove that censorship (which is what banning social media amounts to) _is_ objectively bad.
Neil Postman's Amusing Ourselves to Death is probably worth a read. The problem is with the medium, and how it strips away critical information. Television stripped that information away from typography, TikTok strips away even more. It's fundamentally still the same problem.
It was something like "The Japanese plan is to make our children stupid with their animations to overtake us"
It might be true but also you don't put your child in front of the TV at 3 years old...
It is like serving them beer and then blaming the Belgians for turning our kids into alcoholics.