Although there are now sophisticated techniques for the analysis of social media, socio‐legal studies has yet to draw on them fully. In this article, we demonstrate how Twitter can produce insights about protest, law, and legality, through a case study of protests against the ‘bedroom tax’. The first involved challenging a policy in the courts using a test case or cases. We discuss the litigation strategies and the mess they created and counterpose those strategies with those of four prolific ‘tweeps’ who participated in our study. We argue that, despite the small number of participants, these people have, in their own way, been enormously influential and made things happen. Our position is not evaluative of the different strategies – but, rather, one that recognizes that legality is mobilized in different ways.