This study sought to examine season ticket holders’ usage of social networking sites during live sport consumption. Informed by uses and gratifications theory, the study examined three types of social media use by fans—Twitter/Facebook posting, Instagram/Snapchat posting, and mobile app use—during a live game. Survey data of 400 season ticket holders of a professional National Basketball Association team were analyzed. Regression results showed that age was a significant predictor of the fans’ in-game social media use in terms of Instagram/Snapchat posting and mobile app use, whereas gender was a significant predictor of their Twitter/Facebook posting behavior. Moreover, the study showed a mixed result for the predicted moderating effect of the season ticket holders’ tenure on the predicted relationships between the two personal characteristics (age and gender) and the three types of social media use. Theoretical and practical implications of the study for sports marketing management are discussed.