How about a generic API that hooks your Web app to different social networks? How about the “Web Application Toolkit for Social Network APIs”! (C# and VB)

MSDN Code Gallery - Web Application Toolkit for Social Network APIs

“As social networking Web sites are becoming more and more popular, users often want to access simultaneously the different networks they belong to from one only entry point. For example, one user might want to post the same message they are posting on your site also on Facebook, Twitter, MySpace and so on.

Although many of these social networks provide APIs for accessing their information, you might want to integrate your Web application with several social sites at the same time and be able to do this in a consistent manner, without having to go into numerous modifications in your code with each new social network that you want to incorporate.

This Web Application Toolkit provides a generic “Social Networks” API that allows connecting your Web application with different social networks and managing them through one entry point with a consistent set of methods. In the Toolkit you’ll find examples of how to use the Social Networks API provided to connect a Web application with Facebook and Twitter, allowing you to manage the data provided by these networks in a generic way.

Please notice that this Toolkit includes examples only for reduced set of operations (mainly posting status updates) within the two social networks named before. Through this documentation you’ll find instructions on how to extend this set into more operations and more social networks.

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Note: “This Web Application Toolkit assumes that the developer has basic experience with ASP.NET MVC Framework.”

Once you install it you get the source, some Getting Started and Exploring the Toolkit guide (snapped below);

And a quick snap of the post install folders;