Facebook has issued a final notice to companies and developers that all FBML apps on Facebook Pages will no longer work as of June 6, 2012. Facebook initially announced plans to cease FBML support in September 2011 to give businesses enough time to transition to the new model. Companies that have not converted their apps (or tabs) will find they will no longer work after the June 6 deadline.
With the June 6 deadline rapidly approaching, this is the last chance for businesses to convert any existing FBML apps or tabs in order to preserve their content and functionality.
As Facebook continues to reign as the dominant social media network, maintaining a professional presence on the site has become essential to growing larger and going farther in our social media-centric world.