I'm highly against limiting online access for children/teens.
The internet has been an important learning tool in my life so far. What parents don't understand is that there's not much use in protecting the child from online insults and research. If it's a guy, it will eventually look at researcho. If they post on forums, they get flamed. This teaches them what not to do in public and how to NOT make idiots out of themselves in the real world.