The is a collection of over thirty chapters dealing with the most significant scholarly debates in this rapidly growing field of study. Organized in four broad sections: Institutions, Behavior, Identities, and Law and Policy, the Handbook summarizes and criticizes contemporary debates while pointing out new departures. A comprehensive set of resources, it provides linkages to established theories of media and politics, political communication, governance, deliberative democracy and social movements, all within an interdisciplinary context. The contributors form a strong international cast of established and junior scholars. This is the first publication of its kind in this field; a helpful companion to students and scholars of politics, international relations, communication studies and sociology.