Facebook sees this (by scouring Reddit systematically, the way search engines scour the entire ‘web’ in general). "Upload picture and Facebook tags it with a secretly embedded tag: A008E8E97FA55įriend “A” texts it to another friend – someone you don’t know, their friend Friend “B”, and another friend of theirs Friend “C.”įriend “B” isn’t on Facebook, or maybe they mostly just post to Reddit.įriend “B” posts to Reddit. I have found this at first, there is link to this stack post I've asked the Facebook community about it. Each string starts with "FBMD", two hex characters (1 bytes),Īnd a 16-byte (4-character) length. I've manged to decode one interesting aspect in these strings: the I think that "FBMD" stands for "Facebook Member Data" (but I could be It appears asĪn IPTC Special Instructions metadata field. on, Facebook introduced a new tracking code. This blog post appears to know more about it: I've downloaded 339 images with instruction length 94 after the FBMD, and the following bytes stayed the same: 0 Using IrfanView to set special instructions to "testing" in a JPG without IPTC data, adds these bytes to the header: I haven't been able to decode Facebook's data, but pasting, downloading, and pasting an image again will change the data slightly. That's the International Press Telecommunications Council (IPTC) standard Information Interchange Model (IIM). See delivery memo for specific license.įor consideration only no reproduction in any form without prior,
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