This book consists of the intellectual work of the 2017 European Media and Communication Doctoral Summer School organized in cooperation with the European Communication Research and Education Association (ECREA) at Università Cattolica del Sacro Cuore in Milan, Italy. The chapters cover relevant research topics, structured into three sections: “Intertwining public spheres”, “Trajectories of participation”, “From traditional media to networks”. The European Media and Communication Doctoral Summer School brings together a group of highly qualified doctoral students as well as senior researchers and professors from a diversity of European and non-European countries. The main target of the fourteen-day summer school is to organize an innovative learning process at doctoral level, focusing primarily on enhancing the quality of individual dissertation projects through an intercultural and interdisciplinary exchange and networking programme. It is not merely based on traditional post-graduate teaching approaches like lectures and workshops. The summer school also integrates many group-centred and individual approaches, especially an individualized discussion of doctoral projects, peer-to-peer feedback, and a joint book production.