RT info:eu-repo/semantics/article T1 Challenging Mainstream Media Systems Through Social Media: A Comparative Study of the Facebook Profiles of Two Latin American Student Movements A1 Bacallao Pino, Lázaro Magdiel K1 Redes sociales K1 Comunicación K1 Medios de comunicación K1 Facebook K1 Movimientos sociales K1 Movimientos estudiantiles K1 Social media K1 Collective action K1 Mainstream media K1 Latin American student movements K1 Chile K1 México K1 6308 Comunicaciones Sociales K1 5910.02 Medios de Comunicación de Masas K1 63 Sociología K1 6114.17 Percepciones y Movimientos Sociales AB This article analyzes social movements’ appropriations of social media for challenging mainstream media systems. The study includes two recent Latin American student movements: the Mexican movement #YoSoy132 and the Chilean student movement. A quantitative-qualitative methodology was used to compare their appropriations of social media, which included a statistical analysis of the Facebook profiles of both movements during a selected period of time and Fairclough’s critical discourse analysis of the contents posted and interviews with participants. The findings indicate that there are some relevant specific trends in the appropriation of social media for this specific purpose, mediated by dimensions such as the demands, goals, political communication context, online or offline nature of the mobilization, and organizational characteristics of the movement. PB University of Southern California, Annenberg, Estados Unidos SN 1932-8036 YR 2015 FD 2015 LK https://uvadoc.uva.es/handle/10324/83055 UL https://uvadoc.uva.es/handle/10324/83055 LA eng NO International Journal of Communication, vol. 9, pp. 3702–3720 NO Producción Científica DS UVaDOC RD 26-feb-2026