Young feminists use social media in order to respond to rape culture and to hold accountable the purveyors of its practices and ways of thinking when mainstream news media, police and school authorities do not. This article analyzes how social networks identified with young feminists take shape via social media responses to sexual violence, and how those networks are organized around the conceptual framework of rape culture. Drawing on the concept of response-ability, the article analyzes how recent social media responses to rape culture evidence the affective and technocultural nature of current feminist network building and the ways this online criticism re-imagines the position of feminist witnesses to rape culture.