>What social networks are these?

That's the point, there are always fringe social networks you don't know, and they are probably x10 toxic than reddit comment sections.

It's a bad point though, because those are fringe and don't have network effects that would pressure most children to join them. You become a social outcast if you don't participate in <popular social media of the day>, but the kids participating on fringe sites are likely already outcasts.

We should be aiming to remove purposely addictive things from our children's lives, and all currently popular social media platforms are addiction machines.