Facebook Graph Toolkit
Facebook Graph Toolkit is a robust library for implementing Facebook Api in .NET.
Why Facebook Graph Toolkit?
Easy to use, minimal reference to Facebook Developers website
With the exceptions of a few advanced scenarios such as FQL, the library documents all usage information. The library minimizes the chances where developers must rely on Facebook's official documentation themselves, which is hard to follow, complicated and often inaccurate. These problems are already solved in Facebook Graph Toolkit, providing simplified and up to date implementations to .NET developers.
Rich Api support
Facebook Graph Toolkit implements most of Facebook Api:
The objective of FGT is to simplify development of Facebook apps. FGT is an open source library with no plans of going commercial. Developers are free to modify the library for their own needs, as well as report bugs or make suggestions.