Facebook Development with the .NET Compact Framework
Facebook has become a huge phenomenon in social networking. The site
exposes a developer API to support Web and desktop applications. In
this article we will explore making use of this functionality from a
smart device application. The source code to accompany this article
demonstrates working with key aspects of the Facebook API and tightly
integrating with Microsoft® Windows Mobile®–specific APIs.
http://msdn2.microsoft.com/en-us/library/bb932386.aspx
M$ is so kind on facebook that they released a development kit for them, i guess another bid is just around the corner 
Cheers
Nasir Ali Khan