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It's not new, but it's worth remembering, or knowing, that Facebook embeds tracking data inside photos you download.
TwitterEdin Jusupovic on Twitter“#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..”
@ColinTheMathmo didn't know this thanks.
@ColinTheMathmo wow that's creepy
@pinkprius
No nor me...
NB. Might be handy to know that you can use exiftool to strip it out...
$ exiftool -SpecialInstructions= ./*.jpg