Practical Digital on Facebook
Although I can make Facebook apps to display iFrame tabs (which I did for my own Facebook landing page) I choose not to because I'd end up having to make one for each landing page. There's no need to. I use the iFrame tab app to link to a web page resized for Facebook, and that takes care of everything for me.
The biggest advantage of using it is that it gives me a chance to show off my CSS and HTML skills. And it saves on repetition. Click to see it live.