Thread by @oasace

#facebook is embedding tracking data inside photos you download.

I noticed a structural abnormality when looking at a hex dump of an image file from an unknown origin only to discover it contained what I now understand is an IPTC special instruction. Shocking level of tracking..

The take from this is that they can potentially track photos outside of their own platform with a disturbing level of precision about who originally uploaded the photo (and much more).

I suppose the more concerning issue here is that there is already a variety of advanced techniques to inject data inside photos using steganography such that it would be impossible to forensically detect.

If weaponized, it could be used for tracking; with zero proof.

Pinging @dakami, this might interest you.

CC @kashhill @LaurenGoode @SpectacularSean @CNBCJulianna @FayCortez @lucasmearian @swan_legend @reckless

Happy to comment further on it via [e-mail] (remove + from email)

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@kashhill @LaurenGoode @SpectacularSean @CNBCJulianna @FayCortez @lucasmearian @swan_legend @reckless Nearly forgot @juliacarriew