There’s a couple of creepy posts posts on Engadget today if you value your privacy. World Tracker is a UK-based service that will supposedly track and report location for any GSM cell phone accurately between 50m to 500m based on cell tower data. The service works with O2, Vodafone, Orange and T-Mobile, and provides the location information integrated right into Google maps. And Verizon will be launching a child-tracking service called Chaperone in May that will take advantage of the GPS chip that’s built-in to their kid-oriented Migo cell phones. The service even includes a “geo-fencing” feature where parents will be able to receive a text message if the child leaves a designated area.