A self-supporting system for the mass communication and distribution of content and digital advertising in public spaces. The system has a mechanical structure that sets the system on a building and supports the other components. The system has a control module; a connectivity module; a sensor module; one or more human-machine interfaces; and an energy source. A method for the administration, management, and supervision of the system remotely by an administrator, and a method for receiving user inputs with the system. The system allows the use of pre-existing urban infrastructure for communication and mass distribution of content and digital advertising in public spaces with high capacity for attracting the attention of, and interacting with, the public, without need to install intrusive structures within the urban environment, with a low cost and reduced environmental impact.