Pieter de Wilde is senior researcher at the Department of Transnational Conflict and International Institutions, Social Science Research Center Berlin (WZB). He holds a PhD in political science from the University of Oslo where he conducted research on the politicization of European integration at ARENA, Center for European Studies. Currently, he is working on the WZB project "The Political Sociology of Cosmopolitanism and Communitarianism". Asimina Michailidou is senior researcher at ARENA Centre for European Studies, University of Oslo, Norway. Her work revolves around two themes: the European public sphere and online media communications. She is currently exploring the interplay between online media and mobilization in the context of crisis under ARENA's EUROTRANS project (The Transformation and Sustainability of the European Political Order). Hans-Jorg Trenz is Professor in European Studies at the University of Copenhagen and adjunct Professor at ARENA Centre for European Studies, University of Oslo. His main research interests are in the areas of media, communication and public sphere, civil society, European civilization and identity, migration and ethnic minorities, cultural and political sociology, social and political theory, democracy and constitutionalism in the European Union.