This book combines political theory with media and communications studies in order to formulate a theory of post-truth, concentrating on the latter's preconditions, context, and functions in today's societies. Contrary to the prevalent view of post-truth as primarily manipulative, it is argued that post-truth is, instead, a collusion in which audiences willingly engage with aspirational narratives co-created with the communicators. Meanwhile, the broader meta-framework for post-truth is provided by mediatisation-increasing subjection of a variety of social spheres to media logic and the primacy of media in everyday human activities. Ultimately, post-truth is governed by collective efforts to maximise the pleasure of encountering the world and attempts to set hegemonic benchmarks for such pleasure.