Mar 30, 2011: Static FBML app can no longer be added to Pages as of today. Pages that have the app installed can continue to edit their tabs, but they CAN’T create new tabs.
Per Facebook’s announcement last Summer, we knew that Facebook’s Static FBML application, as well as FBML in general, were to be phased out. Facebook encouraged developers to create iFrame applications and use XFBML (aka Social Plugins) for interacting with the Facebook API.
Although Facebook originally announced March 11, 2011 as the cutoff date for creating FBML canvas applications or adding the Static FBML application to your Fan Page, they now say on the developer blog that the cutoff has been pushed back to Friday, March 18:
Starting Friday, March 18th, you will no longer be able to create new FBML apps and Pages will no longer be able to add the Static FBML app. While all existing apps on Pages using FBML or the Static FBML app will continue to work, we strongly recommend that these apps transition to iframes as soon as possible.
How This Affects your Static FBML Tabs
Although Facebook will be terminating the ability to add Static FBML to your Fan Page, Facebook also says Static FBML “will continue to work,” and many Page admins wonder if they’ll still be able to add new custom tabs, up to the limit of 10 tabs, after March 18.
If you take “continue to work” to mean function as it always has then, yes, you should be able to add new tabs with your Static FBML application up to the limit of 10 tabs. Cat Lee, Product Marketing Manager at Facebook, stated in response to a question about Static FBML that admins would still have the ability to edit their custom Static FBML tabs after the cutoff date.
I will do some testing on Friday, March 18, and post the results here. Then the question will be answered!