Abstract
The COVID-19 pandemic has coincided with a global increase in problematic social networking sites use (PSNSU). By drawing on transactional stress theory and applying the stressor-strain-outcome (SSO) framework, we proposed and verified a chain mediation model to explore the mediating roles of fear of missing out (FoMO) and future anxiety (FA) in the relationship between COVID-19 lockdown stress (CL stress) and PSNSU. Our sample of 670 quarantined college students in China responded to a COVID-19 student stress questionnaire, a social network addiction scale, a fear of missing out scale, and a dark future scale. The results revealed that (1) CL stress significantly positively predicted PSNSU, (2) both FoMO and FA mediated the relationship between CL stress and PSNSU, (3) FoMO significantly positively predicted FA, and (4) a full chain mediation was observed between CL stress and PSNSU.