Do we know if Facebook has an automatic system which tries to detect inappropriate images, and if it is part of the issue here? Or are they relying completely o

Do we know if Facebook has an automatic system which tries to detect inappropriate images, and if it is part of the issue here? Or are they relying completely on having people flagging images? If the latter is true, aren't the friends of the women to "blame", and should be the ones being told to tolerate the images in question?