The FBML Canvas Sample demonstrates how to set up a canvas application on Facebook using Facebook Markup Language (FBML). The application is based off of the Smiley example from Facebook, which allows you to choose a smiley that describes how you're feeling and share that information with your friends. The sample includes both code to build the application and complete instructions to register and set it up on Facebook. Using this sample, you'll learn about several features of the Facebook Developer Toolkit, including interacting with the Facebook API, publishing stories to a user's feed using feed forms, and rendering page content with FBML.