This thesis seeks to provide deeper understandings of the relationship between media and social change in contemporary society, proposing an articulation between Critical Discourse Analysis and Interactional Sociolinguistics in the analysis of the identity construction process occurring in narratives of a subject recognized as social movement spokesman, during his participation in media-interactions. The data for this analysis is formed by personal narratives embedded in arguments materialized in the participation of MV Bill in the television show Câmara Ligada, aired by TV Câmara. MV Bill is one of the most important rappers of the Brazilian Hip Hop movement - he is also the founder of the Central Única das Favelas, CUFA (Central Organization of Slums); writer and filmmaker, both nationally and internationally recognized by his struggle for social change, especially those related to socioeconomic differences, racial prejudice and urban violence. Based on the tridimensional method for critical-discursive analysis proposed by Fairclough and adopting a flexible perspective of Labov s narrative model, the analysis is developed on three levels. For this purpose, the study considers pronominal alternation, resorting to Goffman s notions of structure of participation and format of production, to the concepts of frame as proposed by Bateson and Goffman, as well as to Goffman s notion of footing and to the concept of resistance in narrativization of social structures as used by Edwick and Silbey. The analysis identifies different identities constructed by MV Bill through stories that articulate the arguments he mobilizes in defense of his opinions on issues that concern the relationship between media and social inequality, urban violence, social movements and social and racial prejudices. By showing how, located in a media interaction, these identities are narratively constructed in arguments, the analysis highlights the discursive strategies deployed in the occupation of media agenda and space by a leader who carries the voice of resistance for social transformations. Furthermore, the thesis contributes to enhanced understandings about the importance of the media (and of those who work in it) for the establishment, maintenance and/or transformation of conditions for social exclusion in the current context of profound redefinition of concepts and values that characterize the historic moment in which we are participating.