This article advances research on mediated solidarity, by analyzing the contestation of Islamophobia on the social media platform Twitter, in the context of Brexit, the Christchurch terror attack, and the COVID-19 pandemic. Drawing on a unique longitudinal dataset, gathered over a 5-year period, we elucidate how evolving relations between platforms and trigger events can enable solidarity networks to shift dominant narratives. Taking each event in turn, we demonstrate how on initial analysis these events appear to generate solidarities that fall within a spectrum of solidarity. Brexit produced “expedient solidarities” where Islamophobia was leveraged in support of wider political identities and commitments. The Christchurch terrorist attack...