The feeling of lacking of privacy has become a critical inhibitor of SNS’s development. To investigate how privacy concerns in SNS influence self-disclosure behavior, this study attempts to understand individuals’ privacy regulation strategy based on two distinct boundaries. Specifically, we propose that role conflict and interpersonal distrust positively influence privacy concerns, and perceived communication privacy control and SNS type moderating these two relationships respectively. The ultimate goal of this study is to provide useful guidelines for SNS practitioners to better design the functions that meet users’ needs for privacy control.