How about secret bases? https://www.theguardian.com/world/2018/jan/28/fitness-tracking-app-gives-away-location-of-secret-us-army-bases https://www.theguardian.

How about secret bases? https://www.theguardian.com/world/2018/jan/28/fitness-tracking-app-gives-away-location-of-secret-us-army-bases https://www.theguardian.com/world/2018/jan/28/fitness-tracki...