Pictures of breastfeeding are banned if nipples are exposed but graphic images of dead animals, crushed limbs and drug-taking are allowed, according to a leaked document showing what Facebook considers acceptable.
"Deep flesh wounds" and "crushed heads, limbs" are okay ("as long as no insides are showing"), as are images of people using cannabis but not those of "drunk or unconscious" people.
But breastfeeding a child is not okay if there is nudity.
The document containing the advice was leaked to the Gawker website by a source within the company charged with policing the social network's billions of pictures.
It provides a glimpse of the inner workings of Facebook, which has 800 million users worldwide and could be valued at up to US$100 billion ($119.7 billion) when it floats on the stockmarket.
