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The very simplest, a Google search will often turn up social media profiles, forum posts, and blog comments tied to a particular username.
This exists primarily to help out professional photographers and photo storage tools. Let’s look at some of the data hidden inside of it: Create Date : 20 Make : Samsung Orientation : Horizontal (normal) Flash : No Flash Focal Length : 4.3 mm GPS Position : 28 deg 21′ 27.100″ N, 81 deg 33′ 29.71″ W Even with location geotagging disabled in your camera settings, metadata still provides a tremendous amount of detail about you and your devices, and can even uniquely identify photos taken with your camera.A few years ago, image recognition on a large scale was restricted to law enforcement and corporate security. Free services like Tineye and Google Images will search billions of indexed images on the internet for identical or similar pictures.This isn’t necessarily traditional hash or metadata specific – cropping or resizing an image is not a foolproof way to defeat this (as I show in the screenshot below, where Tineye and Google correctly identified my profile selfie which is substantially cropped on social media).These pieces of information put together say a lot more about your location than they do individually. How much information have you posted on your profile over time as you’ve updated it?
How much information are you providing in private conversations with other users?There are two sets of clues that can give away important personal information in your photos. Consider: is there a window in your photos, and are there identifiable buildings or landmarks outside of it?