1. Faculty of Arts and Humanities, Department of Social Sciences, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
2. Social Sciences Institute, Heinrich-Heine-University, Duesseldorf, Germany
3. Düsseldorf Institute for Internet and Democracy, Heinrich Heine University, Düsseldorf, Germany
4. Department of Computational Communication Science, Ilmenau University of Technology, Ilmenau, Germany