Allows you to track your personal fitness data (either manually entered or uploaded via Nike +, for example) and compare it with other individuals in your neighborhood, as well as comparing neighborhood-by-neighborhood fitness data. Also allows like-minded athletes to connect for workouts, carpools, etc.
Discussion
Like it-there is a new social network for healthy living. Free in app store, or www.hubbubhealth.com. Anyone can join, free, focused on healthy challenges, activities - local, regional or national. In fact, local and state parks & recs are promoting activities. Hubbub was developed in PDX.
Seems like something already done in the commercial sector. If it was somehow tied to city-sponsored parks programs and actual neighborhood associations that would be cool . . . though unsure how that would be accomplished.