[baranul]

I disagree with that, because the teenager should be the parent's responsibility, regardless of how smart or savvy they are. Parents should be talking to their children, communicating what their and society's expectations are. If the parents are attempting to exert technical control over their children, by home router for example, there should be websites or computer shops they can go to. If the parents don't care or are not smart enough to keep up with their teenager, then no type of state mandated gimmick will either.

Teenagers, at that level of intelligence or are that determined, will find ways to circumvent whatever control mechanisms a parent or school is attempting to use. At some point, it is a matter of the teenager respecting their parents and rules. Same for if you told a teenager do not drink and drive. You can setup all kinds of technical barriers to block drunk teenagers from driving, but if they are that "smart", those committed to bad behavior or law breaking will find ways.

[palata]

But again: if all the kids are on social media, is it enough for "good parent" to tell their kid that they should not go there?

From what I remember from being a kid myself, it definitely is not.