Interesting read:
http://www.informationweek.com/news/internet/ebusiness/showArticle.jhtml?articleID=199600005
SKA



On a side note, I've often wondered whether I couldn't configure accounts I post from to have "scheduled" sending -- so I can compose a message (usually a response) and if I don't do anything about it, have it sent after some default amount of time.



I'd heard of this approach but I guess it's not likely to work so well if trolls are aware of the existence of the technique -- one can check whether one is in a phantom zone via another account, no?
That's why a lot of sites also pay attention to the IP addresses of the people who are causing problems. You can frequently catch banned users who are attempting to re-register that way. If push comes to shove you can also deny registration requests from a block of IP addresses; or deny access altogether.
I was active on a hacker/phreaker BBS. To keep out the "bad" guys, we had a unique security feature. During login, the BBS would send a "+++" to get into the modem's command mode, then issue the command to query the device's serial number, and then put the modem back into normal mode.

Original address: https://www.donationcoder.com/forum/index.php?topic=15706.0