[1] Univ Cattolica Sacro Cuore, Dept Commun & Performing Arts, Largo Gemelli 1, I-20123 Milan, Italy
[2] Univ Cattolica Sacro Cuore, Dept Commun, Milan, Italy
[3] Masaryk Univ, Interdisciplinary Res Team Internet & Soc, Brno, Czech Republic
[4] Masaryk Univ, Fac Social Studies, Brno, Czech Republic
[5] Masaryk Univ, Fac Informat, Brno, Czech Republic