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Social media platforms and instant messaging applications have a widespread presence in today’s secondary schools. However, the implications of these ubiquitous communication technologies for adolescent’s social functioning with peers and academic competence in the classroom are not well understood. In fact, research on adolescents’ digital lives has only rarely incorporated direct assessments of adjustment in school environments. The current study addressed these limitations with a school-based data collection. 376 adolescents (M_age = 14.4; 209 girls; including 29.2% Latino/Hispanic, 27.3% White, 28.2% mixed) were recruited from an urban high school and followed for one year. Social reputations were indexed via peer nominations and electronic communication tendencies were assessed using self-report questionnaires. Grade point averages, disciplinary events, and attendance data were …