There is no virus/spam in facebook after omg you tagged in video ! i.e Enable dislike button. This is not any service offered by Facebook.Moreover it is spam/virus which is copied to your friend's wall .Even Facebook is trying to solve this problem by taking some few steps in order to stop this scam/virus in order to give better service to their customers i.e us of course.
These messages appear to be showing up mostly among those users who have fallen for the latest hacks. In addition to sharing the message about how to protect yourself, Facebook alerts the user that they have recently fallen for one of the attacks with a new message that appears when they next login.