1. Department of Media and Communication, Ludwig-Maximilians-Universität München , München, Germany
2. Cline Center for Advanced Social Research, University of Illinois , Urbana-Champaign, USA
3. GESIS Leibniz-Institut für Sozialwissenschaften , Köln, Germany
4. Faculteit der Sociale Wetenschappen, Vrije Universiteit Amsterdam , Amsterdam, The Netherlands
5. Institute for Media and Communication Studies, University of Mannheim , Mannheim, Germany