since most of u guys use facebook....read this....
Lol at that... I've seen this on another site and you'd have to be retarded to get infected.
In a nutshell, you have to go to a website and download a dodgy looking 'Flash Player', and your browser will warn you to say it isn't signed, and the site looks really fake. Then all it does is infects your machine with a load of crap and uses Internet Explorer to send links using your Facebook account to your friends on FB, who would have to go and download, install etc...
Just don't install anything that looks a bit iffy and you'll be fine
And how do you know what happens after the first step...?
I know because I read the reports on 0days and viruses that get posted on security sites, and I read about Koobface and it's second variant W32.Koobface.B when they were first detected.
If you had read the article originally posted, you would know that it explains what happens in a manner that even somebody as ignorant as yourself would understand