Check this out: Facebook using Silverlight
http://vimeo.com/moogaloop.swf?clip_id=4369475&server=vimeo.com&show_title=1&show_byline=1&show_portrait=0&color=&fullscreen=1
Microsoft shows off Facebook Open Stream API demos from Rafe Needleman on Vimeo.
This is actually a set of snapshots highlight WPF usage with Facebook.
Microsoft Previews Great WPF and Silverlight Apps with Facebook OpenStreams API
http://team.silverlight.net/announcements/microsoft-previews-great-wpf-and-silverlight-apps-with-facebook-openstreams-api/
Interestingly, only Neowin seems to have picked it up.
- Microsoft demos Facebook using Silverlight and WPF
http://www.neowin.net/news/main/09/04/28/microsoft-demos-facebook-using-silverlight-and-wpf