[InclinedPlane]

If you know everyone's social graph and you use sneaky ways of identifying people even when they are using different computers or using the private/incognito mode of browsers (which is definitely technologically possible) then perhaps it would be possible to serve up "private" erotic photographs only to a subset of users who are maximally disconnected from the people in the photographs.

I wonder how long you could get away with pulling off something like that if you were as sneaky as possible.