Probably not as necessary once they're like 15 or so, but up that age do not let them be on there on their own. And, of course, make sure they know critical thinking and discuss everything that they see online with them instead of heavy-handedly barring them from it.
Teach them about the satanic panics of the 1970s. Teach them about social pressure, teach them about rationalism, show them some good old James randii.
I've seen some of this trend on discord. It is genuinely nasty and you should be keeping tabs on your kids.