With this class you can detect if a facebook user liked your facebook fanpage. You can display content to users who like your page which is hidden from users who have not liked your fanpage yet. All in all, this class can make your fanpage much more engaging to your fans.

The class is written in PHP and is very easy to use. It has extensive documentation on how to implement this script in your facebook fanpage. It also contains instructions on how to add a canvas page to your facebook fanpage.

It uses the facebook php classes and a facebook developer account is needed. If you have any questions, just post them in the comment section.