Facebook Tab Manager 2.3 lets you specify that content should be shown or not shown depending on whether the viewer has Liked the page that your tab is embedded in.
- Add like=”1″ to the fbtab shortcode if content should only be displayed to people who have liked the page
- Add like=”0″ to the fbtab shortcode if content should only be displayed to people who have NOT liked the page
- You can add an explanation in either of these two cases such as message=”You must like this page before this super-special content will be displayed.”
Consider this an experimental function and test it before you use it too aggressively.
Note that when you preview the content on your own website, it will be displayed as in the “not liked” mode because it’s not being viewed from within Facebook.
Update: I added a tab to www.facebook.com/carrcomm to illustrate this better. What you will see there is the equivalent of this content, as recorded in the WordPress editor for FB Tab Manager: