Theres one associated with facebook and a youtube vid right now. It appears as a friend sending you a vid and then asks you to update your flashplayer (which was BS since i just updated it about a day earlier). Its a bogus .exe. If you click ok you just f'd your computer up and it actually starts sending the vid to your other friends who will likely ok it. I know of at least 4 people this week that were dumb enough to ok it. thankfully i noticed it was bullchit and didnt ok it. If it says you need to download any .exe to run something go to the actual site and download it. If you go from a pop up you will get burned eventually. Everything that pops up looks real as could be but will infect your computer.