Well, I think that in the case of cyberstalking and such, there obviously should be legislation to control and protect people, because sexual predation and identity theft is becoming too often a circumstance in todays world.

However, when it comes to things like message boards, instant messenger networks and chat rooms, the user is at his/her own risk. For instance, you had to accept the Terms of Service upon registration at the BB. Certainly the government has better things to do than prosecute "Double-J @ 72.18.953.12" for telling "Patrick @ 513.83.921.99" to fuck off. :p