Is anyone else just not worried about this at all? I started using IRC at the age of 7 and I turned out okay. My brother who ran with the local hoodlums is still a mess to this day. As as far as my children, I would be more concerned with them going to a nationalist political rally than I would be about them being online. Back in my parents time there were roving religious cults that indoctrinated youth, these days at least my kids can look these up online and realize what they're getting into.

There is a big, seeming North American sentiment that children are incapable of functioning without an adult and need to be protected at all times, rather than fostering their capability for independence. This is not to say you don't watch over them, but they have the capacity to learn from the world just as you do.