Facebook seems unable to stop scammers from circulating malicious Web links that install fake antivirus software on victims' computers.

The scam was spotted Tuesday by antivirus vendor Sophos. At that time the criminals behind it were luring victims into installing the software by offering links purportedly to a video of disgraced former International Monetary Fund Managing Director Dominique Strauss-Kahn and a hotel maid. On Wednesday the scam switched and the link was supposed to be an X-rated video of celebrities Rihanna and Hayden Panettiere.

In both cases there is no such video. People who click on the link are sent to a website that tries to install the fake antivirus software. The scam is slightly different, depending on whether the victim is using a Mac or a PC. On the PC, the site tells victims that they need to install the latest version of Adobe Flash Player to watch the video. But the software they install is actually the fake antivirus program.

More: http://www.pcworld.com/article/229213/