There's a troubling type of porn-based malware that's apparently infected over 110,000 Facebook users in two days. The Facebook malware is disguised as a Flash update. Basically, you'll see a link to a porn video in one of your friend's posts. If you click on it, you'll be taken to a website that may or may not be disguised as YouTube and see the first few seconds of the video. Then the video will prompt you to download a Flash update to keep watching. If you do, you'll infect your computer with a Trojan that can highjack your keyboard and mouse.