Koumei at [unixtime wrote:1202534082[/unixtime]]Anyway, Catharz, what's Tor?
Tor is an 'anonymizer'. They call it an "onion router", (hence Tor, The Onion Router) because it encrypts your communication and sends it through two or three other tor users and then out an exit node to an internet. The basic use is busting through things like The Great Firewall, but it's also good for just keeping your traffic anonymous in general (especially if you're an exit node -- It's hard to tell what traffic is just you and what you're routing).
At any rate, it's ideal for spammers and trolls, because banning you is really just banning that exit node (and they're assholes who don't care about other users, especially the ones providing the service to them). So about half the time you try to access a Chan or something over Tor, it turns out that somebody posting kiddie porn has already gotten that exit node banned.
[Edit] Ironically, anonymous board mods
hate anonymizers, because the fact that the board isn't really anonymous is their only handle to control it with. [/Edit]