fbasync - An Asynchronous Facebook API

Like the title says, this is an asynchronous Facebook API for .NET. It's designed to be both easy to use and scalable/robust. It assumes a working knowledge of the Facebook developer platform. If you're having scalability or performance issues with the Facebook Developer Toolkit or are concerned with the scalability/performance of your Facebook application, this is the library for you.

Go to http://www.codeplex.com/fbasync

See also these related projects.