There’s a new Facebook worm out there. However, it doesn’t seem to be doing anything else than posting a message to people’s Facebook walls.
The message that the worm posts is
“try not to laugh xD http://www.fbhole. com/omg/allow.php?s=a&r=[random number]“
If you follow the link, you end up to a page looking like this:
The page shows a fake error message. If you click anywhere on the page, you will trigger a script that will try to post the same message to your Facebook wall. This is done with an invisible iframe that follows your mouse around – causing you to click on an invisible “publish” button. In addition of the wall message post, nothing else happens.
The worm is spreading like wildfire. To get some idea, try this public search via youropenbook.org.