I've been looking at this for ages now and I cant find anything on the net that provides a solution. When trying to use the tag... ...this is embedded on a tab canvas. The 'Like' button appears when using the app locally, however, it doesn't appear when used on the facebook site. I get this error:- FBML Error (line 264): unknown tag "fb:like" I have FBML enabled in the settings. I've also tried using the iframe alternative with no luck. Any ideas? PS.. I'm using CakePHP