Parents and policy makers have noticed that their kids attention spans are lower, their ability to read and reason is lower, and most alarming their ability to socialize suffers. Of course they are going to try and stop it. Requiring age verification, and putting the onus on the social media sites seems like a way to do this. We are able to verify ages for all sorts of things online, e.g. gambling sites, opening bank accounts, etc. It shouldn't be too hard for social media sites to figure out how to require age verification to create an account that can access their service.