WTF? I can't imagine someone who has been through the trauma of having their intimate photos shared by strangers would be keen to UPLOAD THEIR NUDE PICTURES TO A WEBSITE
One that knows their name and a heap of details about their online life.
I was going to suggest the fingerprinting could be done client side, so that no image data is ever shared with Facebook, but that fingerprint will still be linked to an actual photo when/if it gets uploaded to FB by someone else...