You (should) know that you can't trust email, now you'd better add instant messaging to your list of unreliable tools of communication. Phishers have started to target Yahoo! Instant Messenger in their latest attempt to get personal information from unsuspecting internet users, Cnet reports.

Attackers send instant messages to users, asking them to fill out their Yahoo ID and password on a fake Yahoo! Website. The scheme appears legit because the message seems to originate from somebody in the victim's bud list.

The internet is becoming more and more of a confusing place every day. At least in the real world you can assume that you know somebody when they are facing you – only in movies do people seem to get away with it when they pretend to be someone else.