"Introduction:" The authors examine the agencies of socialisation and attempt to reveal a pattern among these agents. They differentiate social elements and agencies of socialisation, and they endow the latter with three conditions: the requirements of scope, time and intensity and specific set of rules. "Purpose:" The purpose of the paper is to examine which factors satisfy this triple set of requirements. "Methods:" Explanatory method to expose the issue, based on desk research and secondary analysis was used. "Results:" Near the family and the school, the free time space meets the three conditions of the socialization environment (scope, time-intensity, specific set of rules). "Discussion:" The authors believe that these three conditions are not met by any other socialization area. "Conclusions:" All this means that in postmodern society, the institution of the family, which has been with us since pre-modernity, and the institution of the school, which has been with us since modernity, is accompanied by a third socialization macro-agency.