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A man by the name of Edin Jusupovic on Twitter noticed an anomaly in a photo downloaded from Facebook. It would appear that, in the metadata of all the images you download from Facebook, special ICMP instructions are added, possibly tracking precisely who originally uploaded the photo to Facebook and much more. Facebook could then track these photos even outside its own website.
The metadata of a photo is essentially a set of information about the rights and administration of the image in question.
As for ICMP, in simple terms, it is the most popular standard for describing a given image because it allows the user to add accurate and reliable data.
Special instructions in the form of ICMP metadata can be viewed using the Jeffrey's Image Metadata Viewer tool, as shown below, with our Facebook profile image as an example:
As Edin Jusupovic states: “I suppose the more concerning issue here is that there is already a variety of advanced techniques to inject data inside photos [...] such that it would be impossible to [...] detect. If weaponized, it could be used for tracking; with zero proof.”