This work is the result of the research carried out for the elaboration of the master's thesis approved by the Graduate Program in Information Science of the Federal University of Santa Catarina (PGCIN-UFSC), in the year 2018. Its general objective was to verify how the Nucleus of Studies Afro-Brazilians from Santa Catarina use social networks as sources of ethnic-racial information. In addition, the proposal was to analyze the dissemination of knowledge and the uses / appropriations of the information about their studies, relating the presence of black intellectuals with bibliographical production based on the postcolonial approach of theorists such as Grosfoguel, Oliveira and Lins and Bhambra. Investigated also the context of information sources on the Internet and its connection with social networks and the relevance of the works developed by Information Science on this subject. As a methodology, this research was based on the work of Corrêa e Silva (2017) that aims to present, categorize and discuss the present posts on Facebook. From the collected data, tables and graphs were elaborated that provided the analysis of information and social interactions. Finally, it was noticed that each group and nucleus presents its criteria of publication and that Facebook is a social network used by these entities to disseminate information related to its objectives and therefore can be considered a source of ethnic-racial information for its researchers and the community in general.