When we think of smartphones and geo-location the two main use cases that come to mind are mapping and check-ins. These are fine and dandy, but what if you could use smartphones to keep tabs of where your child is? Footprints lets you do just that. The new app (iTunes link), available for both iPhone & iPad, tracks the location of the device and shares it with family and friends. These can then know in real-time a person's exact location. The app can have several use cases, but the parent/child one seems the most compelling. What about privacy? With more and more parents shelling out the cash to equip their tweens and teenagers with iPhones, I don't see why a basic requirement couldn't be running Footprints in the background. As my father put it when I grew up, our household was run as a totalitarian democracy. Ergo, he buys my iPhone, he gets to run whatever app he likes in the background. Parenting rocks.