The social distancing measures in response to the COVID-19 pandemic have transformed people from social to isolated individuals. During that time, social media became a useful tool for satisfying people’s need for social interaction. Previous systematic reviews, however, have focused largely on the negative impact of social media use and ignored the positive side. Hence, this systematic review examined the role of social media use in providing support—be it social, emotional or informational—during the pandemic. Four databases were systematically searched, and the selection procedure followed the Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA) guidelines. Protocol registration: PROSPERO (CRD42022367903). A total of 20 papers were deemed eligible for data extraction. The findings showed that active engagement on social media contributed significantly to maintaining social capital and collective resilience amidst social restrictions. The emotional support obtained from social media was proven effective in alleviating feelings of loneliness and isolation. Also, social media facilitated the rapid dissemination of information and the grassroots mobilization of support by overcoming bureaucratic hurdles and addressing urgent community needs. This review concluded by highlighting the transformative potential of social media in crisis contexts and suggesting implications for mental health interventions and community resilience strategies.

Trust plays a crucial role in implementing public health interventions against the COVID-19 pandemic. We examined the prospective associations of interpersonal, institutional, and media trust with vaccination rates and excess mortality over time in two multinational studies. In study 1, we investigated the country-level relationships between interpersonal trust, vaccination rates, and excess mortality across 54 countries. Interpersonal trust at the country level was calculated by aggregating data of 80,317 participants from the World Values Survey in 2017–20. Data on vaccination rates and excess mortality were obtained from the World Health Organization. Our findings indicated that higher levels of interpersonal trust were linked to higher vaccination rates and lower excess mortality rates in both 2020 and 2021. In study 2, we collected data from 18,171 adults in 35 countries/societies, stratified by age, gender, and region of residence. At the country/society level, interpersonal trust and trust in local healthcare facilities, local healthcare services, and healthcare professionals were associated with higher vaccination rates and lower excess mortality, whereas social media trust was associated with lower vaccination rates and higher excess mortality across three time points over 2 years. Our findings are robust when controlling for country-level covariates of the government stringency index, population density, and medical resources (i.e. critical care beds) in both studies.

Previous studies indicated that individuals with major depressive disorder (MDD) are at high risk of suicide, making the identification of risk factors in suicidal depressive outpatients essential for developing effective prevention and treatment strategies. This study aims to (1) identify emotional risk factors and (2) examine the relationship between cognitive markers—including rumination and self-criticism—and suicidal ideation among depressive outpatients. A total of 165 Chinese clinical outpatients with depression were recruited from local hospitals in Hong Kong. In our sample, 68% of patients with moderate depression and 87.5% of patients with severe depression reported experiencing suicidal thoughts. The results from the logistic regression revealed a significant interaction between rumination and self-critical thoughts in relation to suicidal ideation. Specifically, the ruminative patients with self-critical thoughts were more likely to have suicidal thoughts than those without self-critical thoughts. These findings align with the cognitive model of suicide, suggesting that maladaptive information processing and negative cognitive content are associated with an increased risk of suicide. The current findings have clinical implications for the future development of more specific and accurate mental health assessment, preventive programs, and psychotherapies for depressive outpatients.