All of these analyses raise the question of the inclusion of networks in society: do networks reproduce inequalities, do they possibly reinforce them, or do they still offer small spaces for "play" among social constraints and divisions? Do they constitute for the social sciences an intermediate level of observation, or a relatively autonomous dimension of social life, bearing its own logic and its own dynamics? We have tried here to shed light on some of these dynamics, as part of the implementation of the principles of a relational sociology.