A recent study by the security researchers from Carnegie Mellon reveals that a number of smartphone applications collect your location-related data a lot more than you think. Researchers monitored 23 Android smartphone users for three weeks. The researchers sent a daily “privacy nudge” alert that would ping participants each time an app requested location related data. Researchers concluded: Some apps for Android are tracking user’s movements every three minutes. The team believes that if a user began getting the privacy nudges on a daily basis, they’ll definitely go back to their privacy settings and restrict apps that are tracking users more closely.
Source: https://thehackernews.com/2015/03/location-sharing-apps.html