Did you know that by default the photos you take with your iPhone or Android smart phone include metadata that reveals the exact location where the photos were taken? You can turn this feature off, but if you weren't aware this data was included in the first place you wouldn't know you need to deactivate it.
You can disable geotagging on iOS by following the instructions in this article from Geeksblog.
This article explains how to turn off geotagging on your Android phone.
Finally, this article from dailydot.com discusses the dangers of photo geotagging for people who use online dating services.
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