London - Facebook has created a new rule book telling users the sort of content they can and can't post on the site, including a ban on images of buttocks.
The social network has been criticised in the past for inconsistency when it comes to user-published content.
While images of breastfeeding have been clamped down on, videos of beheadings have made it on to newsfeeds.
Facebook's new Community Standards section includes clarification that some nudity is allowed for artistic purposes, but images of genitals or buttocks will be taken down.
Facebook's head of global policy management, Monika Bickert, said in a blog post: "We hope these updates help provide more clarity about the standards we have."
The Daily Mail reports that members are still allowed to use the website to sell guns. Sales are permitted as long as they ‘comply with all applicable laws’, said the website.
The Independent