You may have noticed recently that Facebook removed the ability to add your Facebook application directly to your Facebook page (for unknown reasons!). So to save my self some pain each time I created this file that I upload to the domain the Facebook page tab will be hosted on. (remember to change the file to have you own Facebook App Id in it…)
Saves sooooo much time! If you have multiple apps running off 1 domain, you add more buttons with the different App Ids.