Contributor(s): Professor Manuel Castells | How are Social Movements shaped by the availability of horizontal communication networks based on the Internet and wireless communication? How can indignation become collective action by the connection between neural networks, digital social networks and urban networks? Which are the cultural and political consequences of these developments? Case studies in different contexts ground a theory of power and social change in the network society presented in the book Communication Power (Oxford University Press, paperback edition 2011) is to be presented in this lecture. Manuel Castells is University Professor and the Wallis Annenberg Chair in Communication Technology and Society at the University of Southern California, Los Angeles. He is a Harold Lasswell Fellow of the American Academy of Political and Social Science, as well as a fellow of the Spanish Royal Academy of Economics, a fellow of the Academia Europea, a fellow of the Mexican Academy of Sciences, and a fellow of the British Academy.