"Hackers, impersonating members’ friends, attacked Facebook by convincing users on Facebook’s Wall to view a video link that they said was hosted by Google. The Wall is a place were members post messages for friends.
The link did not take members to Google, which owns Facebook; instead, it took the unsuspecting members to a Web page where they were asked to download a version of Adobe’s Flash Player and view the movie. Once users downloaded the fake version of Flash, the site installed a Trojan horse that channeled code into their PCs. " – Content courtesy of NewsFactor Network | Hackers Use Facebook for Malware Attack