The clock is ticking to March 11th, 2011 when Facebook will no longer allow the creation of new FBML custom tabs/apps . Users will need to switch to iFrames where you basically create your own app and host your own media that’s used to customize any pages. (Important note: any and all custom content you created with the Static FBML app up to and including March 10, WILL continue to be supported .
While working on our WordPress to Facebook Plugin we discovered that from the 14th March 2011, we will not be able to add a page using the Facebook App and FBML, Facebook is moving to a more standard language.
Last month Facebook decided to start depreciating FBML (Facebook Markup Language) in favour of a new layout, replacing it with iFrames. This came as very good news to the social media market, opening up all sorts of new boundaries and restrictions that FBML previously caused.