Security researchers warn for dislike button scam on Facebook

The scam tricks users into allowing a rogue application to access their profile page, which then posts spam messages.

It also attempts to lure people into completing an online survey, for which the scammers are paid money.

The social network already offers a "like" button that allows people to rate other user's comments and posts.

Graham Cluley of security firm Sophos said it was the latest in a series of "survey scams" that included links to a video purporting to show an anaconda vomiting up a hippo.