Apparently, it's a bot that finds AIM sn's posted on livejournal. And then IM's both users with that message. And then transmits the messages from one user to the other. And apparently it picks users by recent livejournal posts?
Rather amusing, actually.
Now, it'd be even cooler if the bot checked for various words, and wrote out other messages based on the presence of words. Or replaced words with other words. And even cooler, would be if it was to solve a puzzle... and the two people had to work together somehow. (pissing people off would just be lame.)
More information on the bot can be found here:
and also here: