This document discusses Facebook's transition from static FBML to using iframes for custom tabs on Facebook pages. Some key points: - March 11th was the deadline for adding static FBML to new pages, after which only iframes could be used. - Using custom tabs with iframes could improve conversion rates and engagement for pages. However, most fans only interact via the news feed rather than returning to the page. - The timeline for phasing out static FBML started in mid-2009, with iframes becoming the mandatory option by late 2011. - While iframes will take some getting used to, they are presented as the right option for customizing pages going forward. Different pages may