Unfortunately, it’s human work. The paragraph reads “For the six months after he was hired, Speagle would moderate 100 to 200 posts a day. He watched people throw puppies into a raging river, and put lit fireworks in dogs’ mouths. He watched people mutilate the genitals of a live mouse, and chop off a cat’s face with a hatchet. He watched videos of people playing with human fetuses, and says he learned that they are allowed on Facebook ‘as long as the skin is translucent.’ He found that he could no longer sleep for more than two or three hours a night. He would frequently wake up in a cold sweat, crying.”
We know that FB has nudity detection systems, due to their past problems with banning breastfeeding discussion groups.