If you have an Android or Ios smartphone, it defaults to storing the history of all the places you go, at a very fine resolution, for a very long time, and mirrors that data on remote servers from which it might be leaked or subpoenaed. Lifehacker has a great tutorial on deleting your Location History and turning off future logging of your location. They cover both Ios and Android. I just did my devices, and it was very easy.

To disable location reporting or history in Android:

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Open the App Drawer and go to Settings.

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Scroll down and tap Location.

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Scroll down and tap Google Location Settings.

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Tap Location Reporting and Location History, and switch the slider to off for each one.

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To delete your phone's location cache, tap "Delete Location History" at the bottom of the screen under Location History.

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Repeat this process for each Google Account you have on your Android device.