We investigated a comprehensive model to integrate the negative linear association as well as the positive linear association between extroversion and the social use of social-networking-site behaviors. We examined the possibility of a curvilinear relationship between social use of networking sites and extroversion, revealing U-shaped curvilinear relationships between extroversion and total number of friends, browsing, and leaving comments after controlling for the linear relationship. These findings underscore the importance of considering a possible curvilinear relationship between extroversion (individual differences) and related behaviors in relation to social use of social networking sites.

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The Chinese have been spending significantly more time on the Internet during post-pandemic time. When people are confined indoors, there is a greater need to construct an identity and socialize online. Personality traits and perceived value of the media are important factors that affect users' online self-disclosure. This study involved the construction of a mediation model and a moderator model to evaluate the influence of personality traits on self-disclosure on social media. Perceived value was regarded as the mediator while the degree of authenticity was regarded as the moderator. Using a quota sampling method, 1,075 Chinese netizens were surveyed in July and August 2021. The results showed that: (1) The depth of self-disclosure of subjects with extroverted personality was significantly higher than that of those with introverted personality, that is, personality traits affect the depth of self-disclosure; (2) perceived value plays a mediating role in online self-disclosure; (3) The degree of authenticity is a significant moderator in the relationship between personality and self-disclosure. In all, the results from this study contribute to our understanding of how personality traits affect perceived value of media and self-disclosure. This study tested the credibility and validity of the proposed model in the context of the recent COVID-19 pandemic lockdown in China, and the study is a novel approach in that area of research.