Friendship is full of revolutionary potential in the face of a profoundly anti-social capitalist system. Friends in Common explores friendship as a radical practice, capable of upending hierarchies and producing social change. Friendship can transcend social boundaries and political borders. It is vital in building communities and underpinning solidarity. But its transformative potency ensures that it is heavily policed and restrained by the state. Understanding the radical possibilities of friendship can help us rethink our approach to family, work and politics, and show us new routes to resistance and ways to open up spaces of solidarity and escape. The dissonance created by comparing societal expectations around friendship and a lonely reality, especially in the wake of an isolating global pandemic, is deeply alienating. Friends in Common shows that friendship as a political practice is foundational to strengthening revolutionary ideas and projects, and is the antidote to capitalist despair.