This paper is an attempt to recompose a theory of the public from the position of sociology. The author seeks inspirational stimuli for such a goal in classic conceptualisations (Dewey, Arendt, Habermas, Fraser). He monitors the development of the concept of “publicness” and the penetration of information technologies into this domain. The author attempts to outline in form hypothesis the mechanism by which an individual becomes part of the public. In conclusion, the author discovers the public as sociability ferment, which is the universal ground for social movements and organized associations of civil society. The author's reasoning is based on the metatheory of the morphogenetic approach.