We have covered quite a few desktop applications for Facebook like Mobile Facebook, Facebook Desktop Notifications and DeskTube. Here is another desktop Facebook client based on Silverlight 4 from Microsoft. This application is available as a developer preview and you need to install Silverlight 4 developer builds. This free application brings in all the cool features of Facebook to desktop.
To upload photos to your Facebook album, just drag and drop it from your Windows explorer directly into the tool. The application also allows you to videos uploaded by other inside it.
Silverlight Client for Facebook is a very useful desktop app for Facebook users.