The purpose of this paper is to enlighten the effects of the participation to a collective network on social innovation in an enterprise. The author tries to measure the role of the three dimensions of social capital (that is, social interactions, trust and shared vision between the members) and that of the collective structures in the innovation process and the social innovation. This research is based on a study led with a sample of French social companies. The results tend partially to support the hypothesis of a significant relation between (1) social capital and support of a collective network and (2) exchanges and shared experiences, the latter having an impact on (3) process of innovation and social innovation. The persons in charge of the federative structures of the Social Economy will find here arguments to convince managers of social companies, concerned to show their difference with those of the Standard Economy, of getting involved in these networks, places of sharing experiences and sources of social innovation.