That's a really good point. And a case in point - I remember when I was 12, joining forums, there was always a prompt asking me if I was over the age of 13. Obviously I clicked yes and registered anyway!

But part of the danger is the ubiquity of it I think. Every teenager has social media, so there's this massive peer-pressure. If you don't have it, you get picked on. I wonder if banning it would reduce the numbers at least enough to reduce this effect.

I'm definitely not saying this is some silver bullet... But I think we have to do something, and maybe this is a reasonable starting point.