This paper contributes to the debate about the role of Online Health Communities (OHCs) in the healthcare system by concentrating on the kind of information sought and shared by their members. The paper focuses on OHCs for diabetes and discusses the main findings of a qualitative study conducted in Italy and Poland. The Uses and Gratifications approach informed the study, while content analysis was used to perform the analysis. The findings show that OHCs' role goes beyond information and emotional support, which relies on expertise by experience. Indeed, the lack of basic knowledge constituting the essential diabetes literacy for self-management was partially compensated by peer exchange in the OHCs. This raises at least two problems: quality and reliability of the information shared online, and consequences in terms of the equity that a healthcare system provides.