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Comment by Stubb | Hacker News Reader

ExifTool is the standard app for playing with photo metadata:

Looks like Facebook is adding IPTC field Original Transmission Reference, which you can view with:

exiftool -IPTC:OriginalTransmissionReference image.jpg

It seems different for each picture.

It is

  exiftool -IPTC:SpecialInstructions

(it will be a string starting with FBMD.)

And while it’s obviously (can be used for) for tracking, it’s just a exif tag, “Special instructions” is a text for humans, not machine instructions.

So s/Structural abnormality IPTC special instruction/a standard exif tag/ for less click-bait.

FBMD01000ab5030000930700008b130000ae130000011400005d3f00009b740000ce750000f1750000277600005eaa0000