Web Site: Whrrl.com
Whrrl is another social site (and app) designed for mobile users where you can find people with similar interests. Find a group and join it (or create your own). You can then use the location service to keep track of where you are and then find people near you with those interests. You can share recommendations, photos, and stories. It basically gives you the opportunity to learn more about your passion and to share the experience with others.
