Use Google Services? This one might be an interesting read for you. According to an investigation by the Associated Press, Google is “ignoring user requests not to track their location data” even during explicit requests of such kind. The investigation found that apps including e-mail; location history, and maps — are all or have been “continuing to store user information” even when the user clicks “stop”.
The tracking, whether consensual or not, also exists on iPhones and for those who use such Google services on their Apple devices. Princeton computer science experts confirmed the findings for the AP.
While Google denies any wrong doing, The Daily News alike the AP, was able to confirm one obvious problem: merely opening apps like Maps. Takes a snapshot of where you are and it is stored on Google servers.