A teacher recently asked me about location data that is stored on pictures taken with a smartphone. This information is stored alongside the photo as EXIF data (which stands for Exchangeable Image File Format), in addition to other things such as when the photo was taken, and information about the device that took it.
There is a great article on How-to geek about what EXIF data is and how to remove it if you don't want that information to be embedded in your photos.
This is another aspect of photo sharing that students may not be immediately aware of; students might not know that information such as time and place is often bundled along with the actual photo that is shared online, and could be worth discussing!
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