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About the FBMD tag
FBMD is a value Facebook's image pipeline writes into the IPTC IIM
Special Instructions field (record 2, dataset 40), which travels inside a JPEG
APP13 "Photoshop 3.0" segment. Its presence is a strong signal that a JPEG
was uploaded to or downloaded from Facebook, Instagram or Messenger.
IPTC working group documented it in
What does Facebook do with your photo metadata? and reported that
Facebook discards all XMP and most EXIF, keeps the IIM fields (creator,
credit, copyright notice, source, description writer), fills Special Instructions with a
value beginning FBMD, and writes a job identifier that changes on every upload.