Someone just contacted me via AIM, having seen my profile under the "Who's Online" section. This person's AIM screenname was GYSmichael22, and he or she claimed to be Melnag26.
I was suspicious when a trade wouldn't show up, and then when the GYSmichael22 didn't reply to a PM I sent to Melnag26. I also pointed out that Melnag26 hadn't been online all day. At that point, GYSmichael22 signed off of AIM.