Investigating the influence of changing media and communications on society is a long-term aim of research. With the perspective of media effects, this was grasped to be the influence of a certain media content-media coverage, political campaigns, television shows and so on-on audiences. From the point of view of medium theories, this influence is related to a single kind of mediumbooks, television, mobile phones and so on-which shape our communication and perception, and by so doing influence our society's characteristics. Both perspectives have a long and rich tradition, and exploring them has resulted in many, partly path-breaking, contributions-far too many to discuss here.