Social cells

“ The construction of a citizen's social network serves as a filter on the macro environmental flow of political information. In this way, the consequences of the larger environment of opinion depend on the existence of micro environments which expose citizens to surrounding opinion distributions.” Political Environments, Cohesive Social Groups, and the Communication of Public Opinion
Robert H. et al. American Journal of Political Science, Vol. 39, No. 4 (Nov., 1995), pp. 1025-1054.