Totten worked at Thuzi, a social media company, and worked on a C# Facebook app but had so many issues with the Facebook C# SDKs that he worked with a partner to create his own. The eventual project he was working on became the "open source Facebook C# SDK." When he combined his work with Microsoft Windows Azure, his projects really took off.
Microsoft's Nathan Totten has an opinion about Facebook development--in fact, he has a pretty strong opinion, stating that "Developing with Facebook is like building a house on a swamp." For Facebook developers who are having problems with the limitations of the Facebook SDK, Windows Azure can simplify the process.