bowdenweb

First, it’s important to understand the difference between active check-ins and persistent location, also referred to as passive check-ins. User derived location provided by the user through Facebook Places, Gowalla or Foursquare is an active check-in. Passively derived location, which is now possible through Apple’s iOS 4.0 and the Android OS, is what Xtify is using so that user location is extracted from a smartphone on a periodic and continuous basis.