Now this was something that I thought was about to happen! Great stuff, read the article here!

http://www.nytimes.com/2007/10/25/technology/24cnd-facebook.html?ex=1350964800&en=c27e6c86844c7723&ei=5088&partner=rssnyt&emc=rss&pagewanted=all

Lawrence Liu hinted at this sometime ago here. With SharePoint and My Sites you already get some of the Social Networking aspects already in your organisation if you are using SharePoint!