I'm not really sure how this works because i don't know any...uhm..hoo's? So it seems kinda useful if you live in or near a major city. The site said the there are over 300,000 hoo's. I feel like Dr. suss
http://bluehoo.com

About Bluehoo
Bluehoo is a mobile app that helps you find old friends and make new ones in your current vicinity.
Bluehoo uses Bluetooth to discover "hoos" around you right here, right now, and enables you to view those people’s profiles and start conversation
Bluehoo was originally conceived in April 2004 and was one of the first third party applications available for Microsoft’s Windows Mobile phone platform. .
In the spring of 2008 Bluehoo was born. It was immediately apparent that if Bluehoo went viral we would need to scale our infrastructure very, very fast so we started the hunt for a cloud platform to host us.
Being a long standing Microsoft partner (since 1993) using
Windows Azure was a natural choice and the familiar development environment