Prior research has mainly focused on the positive effects of information technology (IT) use. However, emerging research begins to highlight the importance of considering the dark side of IT use. This study examines how enterprise social media (ESM) use (i.e., work- and social- related use) affects employees’ perceived overload (i.e., information and social overload). In addition, we propose that communication visibility moderates the nonlinear relationship between ESM use and overload. The theoretical and practical implications are also discussed.