This paper is concerned with the impact of online technologies on public representations of sexual violence. Drawing on Habermas’s theories of the public sphere and Fraser’s associated critiques, it argues that the Internet has become host to ‘counter-publics’ in which allegations of sexual violence are being received, discussed and acted upon in ways contrary to established social and legal norms. The potentialities of online technology (and social media in particular) to foster and disseminate counter-hegemonic discourses are examined through three case studies in which girls and women have used various online platforms to make extrajudicial allegations of sexual violence and abuse. Where alleged perpetrators of sexual violence are publicly named, it has been argued that such action represents an invasion of their privacy and a subversion of their right to the presumption of innocence and a fair trial. In online contexts such allegations can be received and understood very differently, and these understandings are then circulated in ways that can directly influence ‘old media’ coverage and court outcomes. However, as the paper notes, the principles upon which online counter-publics operate are not radically discontinuous with those of the hegemonic public sphere and not all girls and women have equal access to the support of online networks and activists.