How do young people participate in democratic societies? This book introduces the concept of ‘doing society’ as a new theory of political action. Focused on Finnish youth, it innovatively blends cutting-edge empirical research with agenda-setting theoretical development. Redefining political action, the authors expand beyond traditional public-sphere, scaling from formal to informal and unconventional modes of engaging. The book captures diverse engagement from memes to social movements, from participatory budgeting to street parties and from sleek politicians to detached people in the margins. In doing so, it provides a holistic view of the ways in which young people participate (or do not participate) in society, and their role in cultural change.