This article proposes a reflection on the challenges for the “Scientific-Educational Communication Network” (Weber 2017) on scientific dissemination and criticism of reality in the process of platformization of contemporary societies. Besides, it recognizes the notion of infodemia as a phenomenon associated with the processes of strategic production of information that is harmful to public debate and stressful to the concretization of Public Communication. Through the articulation of two main theoretical notions, Public Communication Networks (Weber 2007; 2011; 2017) and Platform Society (Van Dijck; Poell; De Wall, 2018; Van Dijck, 2019), this article problematizes aspects related to limits and opportunities in the contemporary communicational context and the logic of capturing, processing, and organizing information from online platforms within the scope of the Scientific-Educational Communication Network. As a proposal for empirical observation, it presents the Public Communication Observatory (OBCOMP). This project is hosted by the Postgraduate Program in Communication at the Federal University of Rio Grande do Sul (PPGCOM/UFRGS) and is based on its communication platform on Facebook. Based on tests with sponsored publications, it was found that adherence to the commercial logic of platform operation, especially when purchasing ads, is fundamental for the communicational reach in the Networks. It reinforces the idea that free service is not enough to obtain the visibility needed for public communication