This work is the revised version of my dissertation and was created during my time as a research assistant at the University of Erfurt as part of the DFG project "Mobile Communication, Telematization of Everyday Life, and the Change of Media Practices." I would like to thank Professor Joachim R. Höflich for the opportunity to complete the dissertation in this context, as well as for his supervision, support, and assistance. I also extend my gratitude to Professor Friedrich Krotz, who co-supervised the work and whose critical yet motivating feedback has always been very helpful to me. I would like to sincerely thank Professor Tanja Thomas for her support and for the opportunity to give a lecture as part of the lecture series "Media Culture and Social Action" at the University of Lübeck, as well as for my contribution to the corresponding anthology.