Since June 2010, Apple devices appear to have been tracking their owners’ locations and storing data about their whereabouts without their knowledge. The hidden tracking file has been posted on a site called iPhone Tracker. Any iPhone user can use this program to see a map of their location over time since June 2010.
http://www.cnn.com/2011/TECH/mobile/04/20/iphone.tracking/index.html?hpt=T2
It's Interesting 