The "tyranny" of contents and processes of concentration As the place of premise, first lines can contain some acknowledgements about the extraordinary meaning that the Net has for a relevant part of worldwide people, namely a treasure of great cultural and intellectual vivacity, of incommensurable usefulness, expressivities and intelligence. But, after this admission, we have to do some reflections on how this whole of contents is physically supported and how network structures are shaping to respond in a sustainable way with respect to its evolutions. Given the …