Objective: The current study aims to explain the differences between high school students’ selfdisclosure in WeChat moments and QQ space from the perspective of disclosure decision-making model.
Methods: 445 high school students were investigated with the self-disclosure online scale and the subjective risk
scale. Results: (1) the breadth and depth of self-disclosure in QQ space were both significantly higher than that
in WeChat moments. (2) The subjective risk of WeChat moments is significantly higher than that of QQ space,
and the subjective risk significantly negatively predicts the breadth of self-disclosure online. Conclusion: there
are significant differences in the depth and breadth of self-disclosure online among high school students in
WeChat moments and QQ space, and the subjective risk has a significant negative impact on the breadth of selfdisclosure online among high school students.