This paper examines two experiences of social networks developed as a space for strengthening public health policies in the Brazilian context. To describe and analyze some possibilities of using social networks as devices linked to public health policies based on the experience of two comparative cases currently underway in Brazil: The HumanizaSUS Network and the Community of Primary Care Practices.This is qualitative research with a comparative case study approach, with emphasis on the exploitation of data available in the public platform of both networks and publications around these two experiences.Webometric data of the cases studied will be shown, pointing out aspects of differentiation and similarity between them from three axes of analysis: (1) theoretical-conceptual framework; (2) the design of the platform, its functionalities and its daily support process; (3) the singularities of the related policies. The discussion of these points indicates that social networks can function as devices for education, production of a collection of experiences, clinical collaboration and especially a collaborative creation of spaces for sharing experiences and collective reflection on the daily construction of public policy.