In the wake of the recent tragedy that struck Japan, we released a People Finder Application, YottoFinder, for the affected people of Japan and other neighboring areas. Here is the link,
http://apps.facebook.com/yottofinder
The application runs on the Facebook Platform, and helps you submit and receive information about your friends and family affected by this natural calamity. It is similar to Google Person Finder, but the fact that it runs on Facebook and the fact that you can submit information about your friends only, makes the data more genuine and spam-free.
The information you submit is then made available through a public search, thereby helping other people to become aware of the status and whereabouts of those affected.
We would be glad to receive your feedback on this.