Facebook’s always at the centre of some privacy controversy or other these days. Programmer Edin Jusupovic, spotted something rather odd recently when looking at a hex dump of an image file of unknown origin. After doing a little investigation, it appears to be IPTC “Special Instructions” injected into the image by Facebook.
This header is then kept with the file, as it gets downloaded and reposted around the web. This data seems to have been around since at least 2015, but it seems to have largely gone unnoticed. Now, though, it’s seeing renewed interest in light of recent events and it presents, in Jusupovic’s words, a “shocking level of tracking”.
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