Online social networking has deeply penetrated university campuses, influencing multiple aspects of student life. We investigate the impacts of individual online social networking engagement (e.g., on Facebook) from a pedagogical standpoint. Based on social learning theory, we argue that online social networking engagement leads university students to attain positive learning outcomes (self-esteem development, satisfaction with university life, and performance). We further argue that three attributions of social learning (self-efficacy belief, social acceptance and acculturation) bridge individual online social networking engagement with desired learning outcomes. Results from a survey accompanied by focus group discussions demonstrate the substantial impact of university student online social networking on social learning processes and outcomes.