The guidelines also prohibit depictions of self-harm, threats and harassment, but do not mention animal cruelty, as this two-year-old (now closed) Change.org petition noted. The petitioner cited pages like "Dogs Suck" and "I Hate Pit Bulls," which no longer appear to be active.
When it comes to animal cruelty, Facebook has a history of initially keeping pages active, then removing them in response to criticism. Last year, a page promoting a dog fighter and his dog Chiko, for instance, was at first not removed "for containing credible threat of violence," despite graphic videos of the dog tearing into his victims. Later it was found to violate standards and removed. In July, Facebook also took down photos of 19-year-old hunter Kendall Jones posing with dead animals, including rare species like a rhinoceros and elephant - after more than 300,000 people signed a petition asking them to.
The Humane Society of the United States urges people to report animal abuse on social media. Cruelty in YouTube videos, for instance, can be flagged, and HSUS also has a form to report animals being harmed anywhere on the web.