[comatose]

come on , this isn't complicated, don't over think it-- a woman (or man) meets someone and sends a nude; regrets the next morning; fb im the image to themselves and flags it their partner uploads it, a fb employee sees a nude that matched a hash, the only reason they see it is the hash matched, you're trusting fb not to do anything but hash the image and if your partner alters it maybe the hash doesn't match, but typically the upload is the same and when it's clear it's revenge porn the account is banned-- it'll probably catch a boatload of bags of dicks if people trust fb, but maybe they shouldn't