Facebook has allowed pages and posts that celebrate assaulting women.  For example, from the article:

“Groups and images with allegedly humorous titles like “Raping a Pregnant B***h and Telling Your Friends You Had a Threesome” have always been only a click away and, under Facebook’s content policy until now, stood a better chance of surviving moderator review than photos of breastfeeding babies did.”

Click here to read an article describing the problem and how a social activist campaign has motivated Facebook to review and update their content rules.