At the PDC03 there was a cool demo in the keynote on social network enabled software. Now 3 years later we see SNARF.
SNARF, the Social Network and Relationship Finder, developed by Microsoft Research and available for download, is designed to help computer users cope with precisely such scenarios. SNARF, a complement to e-mail programs such as Outlook, filters and sorts e-mail based on the type of message and the user’s history with an e-mail correspondent. The result: a collection of alternative views of your e-mail that can help you make sense of the deluge.
Read more at source: http://research.microsoft.com/displayArticle.aspx?id=1365