Before I wade through all the pat answers and get into the behavioural aspects of this "monster" if you are a parent here are some quick suggestions.

Enter into a dialogue with your kids. They need to know the pitfalls and hazards. Don't have a cow...educate.

Learn about the tools they are using and the places they like to hang out in. You have to technically know what is going on. You might not be as smart as them but you have to be that smart.

Jerry Pournelle discovers his site is banned in a filter the military is using.

http://www.jerrypournelle.com/view/view419.html#banned

 He wonders why and asks the questions. I briefly answer them here  We've been producing filters since mid 1995 which is about as soon as it could have been done.

Gerry asks: Why would anyone allow them to dictate who is allowed access to whom ?

Stolen list thread
 

This is interesting....Daniel writes

 It is getting Draconian out there folks...

http://slashdot.org/article.pl?sid=07/01/13/0753209