Nipples are rude but crushed limbs are OK – a document leak has revealed the social network's attitudes to sex and violence

Facebook bans images of breastfeeding if nipples are exposed – but allows "graphic images" of animals if shown "in the context of food processing or hunting as it occurs in nature". Equally, pictures of bodily fluids – except semen – are allowed as long as no human is included in the picture; but "deep flesh wounds" and "crushed heads, limbs" are OK ("as long as no insides are showing"), as are images of people using marijuana but not those of "drunk or unconscious" people.