This book examines how the young in Northeast Asia engage with the political, especially in terms of the production, reformulation, or contestation of their national identities.Through case studies covering China, Japan, South Korea, North Korea and Taiwan, the contributions provide a study of the online spaces where youth engage with current debates regarding national identities.The book also unpacks the distinctive forms of expression and negotiation of national identities favoured by younger generations across Northeast Asia and asks questions specifically raised by their political mobilisation.For example, how their public mobilisation for a given cause has forced them to rethink their place in national and global communities. This book will be a valuable resource for scholars and students of East Asian culture and politics, media studies and youth studies.The Introduction of this book is freely available as a downloadable Open Access at http://www.taylorfrancis.com under a Creative Commons Attribution-Non Commercial-No Derivatives (CC-BY-NC-ND) 4.0 license.