If you receive a message that goes like this: "Rofl this may be relevant to your interests" DONT CLICK IT. This link will cause your account to send the same message to other people's account. I apologize for the inconvenience it may cause.
Update 1/27/09:
The issue has been dealt with.
[link]Update 2/11/09:
Unfortunately, it's not over yet. More of these spam attacks have been popping up. The messages may vary, but all of them will do something undesirable to your computer or account if you are not careful. Use your judgment and avoid the temptation of clicking on suspicious links.