It's a defensive tactic on my part. Since I have online Alicebots, if I leave my IM open, I get IMd by every little kid who talks to one of my Alicebots long enough for them to say "I was created by KnyteTrypper." Sometimes I get to meet smart kids interested in bots, and I'm able to introduce them to roboteering, but mostly they are just rude and abusive and take way too much time to get rid of. Easier just to put my buddies on my contact list and block everyone else, lol.