Contemporary society is characterized by the great diffusion of the mass media, thanks to the development of sophisticated technologies - internet in particular - that are able to reach easily every individual anywhere in the world. The barriers of space and time are canceled in favor of a comprehensive and continuous communication addressed to an indistinct aggregate of individuals: the mass. The new forms of communication are taking a central role in the lives of individuals and societies. It is the "fourth power" that is able to produce cultural revolutions and global socio-political transformations.
Keywords: Mass communication, mass media, fourth power