WhiteWolf wrote:I have a person that is behaving like a troll on a forum that I am on.
First, deal with the matter better on the forum.
IGNORE him - stop feeding him.
Make a formal complaint to the owner / manager / moderator - do they really want trolls running amok and upsetting contributors?
If that fails, then consider you membership - do you want to be a member of a forum that allows such idiots? And when you join other forums, join under a false name and keep your real ID separate, at least until you are sure you have not been followed.
WhiteWolf wrote:I am afraid he is going to lose his real world button eventually ...
That's a real risk, but a small one; unless something he's said suggests it? If you have real evidence (threats etc) that link to the real world, then you must go to the police.
Meantime,start collecting evidence of his activities - it may not matter now, but will be useful if he does turn real worldly.