This study examines the socio-cultural notion of “post-truth” as the condition of modern media and a new model of mass media communication. The authors analyzed the empirical implications, the ideological foundations, and the social determinants of this phenomenon. Moreover, the authors examined the socio-cultural notion of “post-truth” and its connections with “post-democracy” and “post-journalism”. The study aimed to predict the ontological and epistemological consequences of the post-modernistic philosophy in mass communication. In comparing the opinions of mass media theoreticians, the authors concluded that this theme is extremely divisive.