

If someone is posting unmodified content to social media, it’s in their interests to sign and attest that authenticity.
Why is it in their interests?
Later, they may find copies of their original content, with trivial edits and others’ signatures attesting to the authenticity of “their” work, even though “they” didn’t travel to Antarctica and spend the winter to get that photo of the emperors incubating their eggs…




It’s the same thing as with “watermarking” music files - it’s a bunch of hot air, anybody anywhere can just play them back and recapture the analog, and if the watermark survives that then it’s absolutely going to be audible.