The geolocation wars are well underway. If you need any proof of that, simply look at this thread in Quora . A startup posted a question wondering which place database they should use for their new check-in app. The responses? Foursquare: Us. Gowalla: Us. SimpleGeo: Us. Factual: Us. Locationary: Us. Each of these companies, along with a few other big ones not practicing the art of self-promotion on Quora (Google, Facebook, Skyhook) are all in the midst of what is sure to be a drawn-out battle to become the underlying location layer that lets a thousand other startups bloom on top of it.