The aim of this study was to examine the role played by the extroversion and social self-concept in the relationship between internet addiction and social media burnout. 200 individuals from the Brazilian general population between the ages of 18 and 45 participated and responded to the Compulsive Internet Use Scale, the Social Media Burnout Scale, the Multidimensional Self-Concept Scale, and a scale of reduced markers for personality assessment. The data were analyzed with the SPSS software. Results showed positive and statistically significant correlations between internet addiction and social media burnout, as well as negative correlations between both variables with social self-concept and extroversion. Furthermore, social self-concept had a significant indirect effect on the relationship between Internet addiction and social media burnout by appearing to mediate this relationship. This study contributes to the endorsement of the literature on the subject and prompts consideration of interventions needed by psychologists to promote social skills and appropriate internet use.