Previous studies have found that website design quality is one main factor affecting consumers' initial online purchase behavior. For consumers' repurchase behavior, in addition to website design quality, service quality is another important factor. Which factor is more important in determining consumers' repurchase intention? Our results show that, compared with website design quality, service quality has significantly stronger effects on consumers' trust and satisfaction, both of which lead to their repurchase intention.

Intense competition requires that social media service providers execute two major business strategies: exploiting current functions while simultaneously exploring incremental innovation. Realization of these strategies is related to two types of member behavior: reinforced use and varied use. Drawing on identity theories, we examine the common and differential effects of two levels of social self-identity—relational identity and social identity—on reinforced and varied use and the moderating role of inertia on their effects on social media usage. Our results reveal that, although both identities have similar effects on usage behavior, users with higher social identities are more oriented toward variety seeking, while those with stronger relational identities are more oriented toward reinforcement. Inertia negatively moderates the impacts of social identity on social media use, but not the relationships between relational identity and social media use. The current research contributes to theory by decomposing social media usage into reinforced and varied use and reveals the common and differential influences of two levels of social self-identity on user behavior. Social media service providers should focus more on social identity to promote varied use and focus more on relational identity when they want to enhance reinforced use.

Existing research on user acceptance of mobile commerce has found that technological perceptions—such as perceived usefulness, perceived ease of use, and perceived compatibility—had significant effects on user behavior. However, the effects of personality traits have seldom been examined. The purpose of this research is to examine the effects of five personality traits of extraversion, agreeableness, openness to experience, conscientiousness, and neuroticism on user adoption of mobile commerce. Partial least squares was employed to conduct data analysis. The results show that extraversion has a strong effect on trust, whereas neuroticism has significantly negative effects on trust and perceived usefulness, both of which determine user intention to adopt mobile commerce.