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Article provides a general framework of Manuel Castells' theory of the Network Society which is successively presented in his three-book series entitled: 'The Information Age: Economy, Society and Culture'. The concept of the Network Society refers to general social change which reflects on technological transformation connected with rapid diffusion of ICTs, a process popularly conceived as 'informational revolution'. This explains why we start with the notion of 'informational society' and 'knowledge-based society' terms introduced by such economists like Machlup and Porat, and subsequently popularised by Bell, Ginzberg, Naisbitt, Drucker, Toffler and Masuda. Nowadays we have observed an immense stream of research that is concentrated on social, economic, political and cultural consequences of rapid digitalisation (e.g. Social Informatics). In the field of the Informational Age and its cultural consequences, Manuel Castells stand for the most important theoretician.