Recently I read about a massive geolocation data leak from Gravy Analytics, which exposed more than 2000 apps, both in AppStore and Google Play, that secretly collect geolocation data without user consent. Oftentimes, even without developers` knowledge.
I looked into the list and found at least 3 apps I have installed on my iPhone. Take a look for yourself!
This made me come up with an idea to track myself down externally, e.g. to buy my geolocation data leaked by some application.