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The major challenge for social networking services (SNS) has been in getting users to exhibit prosocial behavior by active participation in creating and sharing content. We seek to integrate and reconcile the varying, and sometimes conflicting, explanations of prosocial behaviors at SNS. Rooted in postadoption behavior and commitment theory, our study offers three distinct mechanisms that regulate how one’s experience at an SNS translates into commitment that leads to prosocial behavior. In particular, satisfaction, affective commitment, and active participation substantiate a dedication-based mechanism; past investments, continuance commitment, and resulting inattention to alternatives form a constraint-based mechanism; and social support, normative commitment and users’ intentions to moderate comments are a third, obligation-based mechanism. We empirically tested this tripartite model against data …