Facebook has agreed to change its policies on content promoting rape following a viral grassroots campaign by feminist activists. The social media site had come under fire for allowing posts that back violence against women despite banning other forms of hate speech. Using the Twitter hashtag #FBRape, tens of thousands of people targeted Facebook’s sponsors, leading some to pull their ads. On Tuesday, Facebook announced it would work with Women, Action and the Media and other feminist groups to update its policies.