"My Friends," is a Bing Map App that uses Facebook APIs to pull in your friends from Facebook. "Fire up app, log in via Facebook Connect, select "Allow" to allow Bing Maps to connect to your profile (to get your friend list) and any of your friends who've listed a "Current City" in their profile will have their profile picture pinned to map. Look at where all of your Facebook friends are at any given time! Clicking their picture will show you their picture & status. We also have de-clustering algorithm in place so if you've a number of friends in one place it'll spin their photos into a circle and tether them back to the location with a line. Finally, you can write directly on someone's Facebook wall from within in Bing Maps," explains Chris Pendleton.
Also, Bing Maps preview is now a fully supported greatness for the world to see. All the features such as Bing Map App ratings, ICE Photosynth Panoramas, map overlays, etc. can now be viewed on Bing Maps site (Silverlight 4 required).
More Info: My Friends map app