In 1999, Seattle activists adopted cutting-edge livestream technology to cover protests against the World Trade Organization. The Indymedia network that emerged established the importance of alternative, anti-capitalist media for marginalized groups. Sandra Jeppesen traces subsequent global developments in activist media practices, investigating their role in contesting interlocking systems of capitalism, racism, colonialism, heteronormativity, and gender oppression by harnessing the transformative power of technologies for political purposes. Based on participatory research, Transformative Media offers new insights into the challenges and contradictions behind the scenes of some of the world's most exciting and controversial social movements.