1. Department of Communication; University of Münster; 48143 Münster Germany
2. Research Group for Media and ICT; iMinds & Ghent University; Ghent 9000 Belgium
3. Institute of Communication Studies; University Hohenheim; 70599 Stuttgart Germany
4. Educational Psychology Research Group; Ruhr University Bochum; 44801 Bochum Germany
5. Department of Communication; Virginia Tech; Blacksburg VA 24061 USA
6. Department of Communication Studies; Concordia University; Montreal Canada
7. School of Information Sciences; University of Tampere; Tampere Finland