The article is devoted to the analysis of the sociocultural phenomenon of ‘post-truth’ in the modern communication space and the model of mass communication that is formed on this basis. Empirical manifestations, philosophical foundations and social determinants of the phenomenon are investigated; an attempt is made to elucidate the sociocultural essence of post-truth in conjunction with the phenomena of ‘post-democracy’ and ‘post-journalism’, a forecast of the effects of the subjects of communication following the attitudes of postmodern philosophy is given. The authors pay special attention to the comparison of the positions of theorists of mass communication, showing the ambivalence of the analyzed phenomena and the ambiguity in the assessments of the phenomena and situations under consideration.