Getting Started › Apps on Facebook.com
(via Facbook Developer Blog: Introducing iframe Tabs for Pages)
… Many useful applications have been built for Facebook Pages like BandPage for artists to share their music with fans and Shop Now to help Pages sell merchandise on Facebook. As of today, you can build your Page Tab apps using iframes rather than FBML. This means you can now build apps that run across Facebook (including Pages and Canvas applications) using the same simple, standards-based web programming model (HTML, JavaScript, and CSS). In addition, you can easily integrate social plugins and the Graph API within your tab. …
