From the website:

Looking for a golf buddy in your neighborhood? Perhaps looking to form a volunteer group in your community? Or, do you have a recommendation to share with your neighbors? Why wait? Discover new friends in the neighborhood on FatDoor!
Sign up and claim your profile. Then, you can meet your neighbors, change your personal settings, upload a picture and set your privacy levels. Enhance your profile by adding interests, pictures and posting 'shout outs' to the neighborhood. Connect with your neighbors, family and friends. Join your favorite community groups or create one! Edit anything around the neighborhood (think WIKI)! Review a restaurant, say something nice about your neighbor, and so on. Use fatdoor to connect you with neighbors, community groups and events around you!