to prevent online harassment, send an email to people he has or may contact giving them a blacklist that includes his email address to add to their spam filter and IM/MSN/whatever alias to their messaging client.
if you want him to stop looking at a personal website (like a "blog" or social networking site) you will need to change your viewing setting to be more restrictive.
a more drastic measure would be to get new account names that he wont know.
then again, you could go to more extreme measures like these:
(in ascending order)
- using a botnet to DDoS him
- going to his house/apartment and steal his computer
- going to his house/apartment and smashing his computer
- burning down his entire house/apartment
- killing his pets spreading the entrails around his house/apartment
- killing him
- killing his girlfriend
- killing him slowly
- killing his girlfriend and framing him for the murder
- killing his girlfriend slowly while he watches and framing him for the murder
- making him read every one of Vince(1)'s posts
- making him meet Vince(1) in Richmond at a diner where Meade is playing
i know the last two are hard to stomach but there is no doubt that he would kill himself after a horrific experience of that magnitude.
"the wisdom of the wise will perish, the intelligence of the intelligent will vanish."