Back in the days of Aol messenger, i was a little kid of 10-11.
We were never banned even when the pervs started PMing. Actually, it was a big joke in our household. We'd lead them on and then tell them we have 1 leg, strange diseases etc. We laughed together, as a family and when i did find something sick or twisted my parents were the first to know.
This approach has made me more perceptive to the world and the many freaks in it.
No point in hiding your kids from the world. You're not raising children, you're raising adults.