Facebook Chat Virus: how to manage and remove it

(La versione italiana la trovate qui)
Have you clicked a link in FaceBook chat and now your computer is infected? Have you received a strange message with a link in FaceBook chat and you don't know what is it? This is a good starting point to find more about.
How the virus worksSince December, there is a virus crawling through the FaceBook Chat: a worm, to be more accurateWhat is this virus?Pretty easy: like almost all the infections you can get through a social network, it is just a simple message you'll receive in FaceBook Chat. One of your friend will send you this message, which is something like "foto :-)", "pic :)" and a link to the photo itself. Presumably.DON'T click it.Whatever thing could happen, don't click that link. Never.What to do, then? The first thing is "Don't panic". Until now, nothing bad happened: you've only received a message with a potential virus, but the virus is not in your computer, yet. Simply close that chat window and everything will be fine. And DON'T click the link.As a second step, I'd suggest you to write a message to your friend, the one who sent you the link with the virus. It's not mandatory, but it's a nice thing from you. DON'T copy the link in the message: just write "I got a strange link from you" and explain what happened and everything will be fine. If you got the link from his/her Facebook profile, this means that your friend is already infected by that virus and now the virus itself is trying to spread, without your friend ever notice it. If you inform him/her, you'll surely do him/her a favour and you'll help avoiding that other friends will be infected by the virusNow, what happens if you click the link?First of all, you made a really bad move. But well, it can happen. Maybe you involuntarily clicked it, or you really trusted your friend, who knows. It would be better to be more cautious in the Web, but by now you did it. Time to find a solution. Let's see.If you click the link, you'll be send to a fake FaceBook page, which says that the picture you were looking for has been moved, for whatever reason. If you want to see the picture, you must click on a button, which looks exactly like a common FaceBook button, like the one you usually click in order to activate an app. Have you clicked it? Great! Now, your computer has just won a new virus.Continua...»