1. The document summarizes a talk on building applications for Facebook using Rails. It discusses the anatomy of Facebook Canvas requests, the use of FBML and FBJS as proprietary markup languages, and compatibility issues with the Rails MVC model.
2. It also evaluates RFacebook, an open-source Ruby library for interacting with the Facebook API, noting some bugs and design issues.
3. Additionally, the document proposes the idea of combining Facebook Canvas apps and IFrame apps to leverage both cookies and sandboxed JavaScript, but notes technical challenges in allowing the two to freely communicate.
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