On the Hour

This idea is for a facebook app, where your phone uses either the GPS or triangulation to calculate where you are on the hour... And depending on what your permissions are either it can be 8 hours a day / 24 hours a day... You can also set permissions as to how many levels deep people can see where you are, aka only your friends or everyone... You can also sign up so after everyone checks in with there data it txt's you with who is within a certain distance of your location.

Marketing folks can sell the data as where people have been and direct advertising to people who are familiar with the area of your store etc...