Relying on theoretical background (philosophical, cultural, communicative, and linguistic concepts) and the empirical study of communication within such social networks as YouTube, Instagram and Facebook, the authors substantiate the advent and development of new cultures existing in the Internet Galaxy, i.e. linguocultures of social networks, in modern digital and mass-communication community. These new phenomena represent autonomous, high-quality standard and valuable communicative systems appearing on digital network platforms, which are characterized by particular linguistic and communicative aspects: symbolic tools of public communication, standards of verbal behavior, communication formats, principles of self-organization and self-reproduction. The authors also emphasize the autonomy of new cultures thus highlighting the intervention from social institutes of power and business to ensure social control and management, which, therefore, results in both horizontal and vertical dimensions of linguocultures within social networks. Taking the above into account the authors forecast alternative options related to the future of new cultures.