Facebook Embedding Tracking Data Inside Photos You Download
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.
more info https://stackoverflow.com/questions/31120222/iptc-metadata-automatically-added-to-uploaded-images-on-facebook
See also: Screenshot Tracking Watermark