Possible new AIM trojan?

[super_tigris]

Someone I don't frequently talk to sent me an IM earlier today that said something along the lines of, "should I post this picture on myspace [link to image shack (as text URL)]". The link actually went to another site. Luckily, I highlight my links to make sure I'm not being redirected somewhere I don't want to be. I exited the conversation, and now I'm wondering, should I tell this person they've got a trojan. Normally I would, but it's not really someone I'm friend's with and it could've been intentional. Does anyone have experience in this area, who would know for sure if this is more than likely a trojan?