Mr. Reeves just uses different usernames every time he's outted. There's been a few new members on the Charger Board who have distinctly similar profiles.
As far as keeping track of him and his IP #'s, that's an AOL thing (same goes for a few of the other monster internet servers). Each time he connects to the internet, his local AOL server assigns an IP address - sometimes it's the same one he was assigned before, but a lot of times it's different.
I hear they're working on eliminating that and in Mr. R's case it couldn't be soon enough.
You can spray paint a skunk's stripe black but he'll still smell like sh*t.