Hate to be rather frank here, but it's the internet. No one is safe, when you give someone complete anonymousness, 9 out of 10 people are going to abuse it. What the hell are children doing on the internet unsupervised anyway? Sure, I can see teenagers, but are you going to let your 8 year old kid open up a portal, that every person in the world can enter at any time?
That's basically what the internet is. Anyone can open up a conversation with anyone, at any time. Email, IM, chatrooms, the possibilities for pedophiles to get at your kids are endless. And the internet doesn't work like real life. You can't just say "Don't get in a stranger's car" and think your job is done. Parents really need to shape the fuck up, but that is a rant for another time, perhaps for it's own thread.
My 2 cents.