Although online health communities (OHCs) are increasingly popular in public health promotion, few studies have explored the factors influencing patient e-health literacy in OHCs. This paper aims to address the above gap. Based on social cognitive theory, we identified one behavioral factor (i.e., health knowledge seeking) and one social environmental factor (i.e., social interaction ties) and proposed that both health knowledge seeking and social interaction ties directly influence patient e-health literacy; in addition, social interaction ties positively moderate the effect of health knowledge seeking on patient e-health literacy. We collected 333 valid data points and verified our three hypotheses. The empirical results provide two crucial findings. First, both health knowledge seeking and social interaction ties positively influence patient e-health literacy in OHCs. Second, social interaction ties positively moderate the effect of health knowledge seeking on patient e-health literacy. These findings firstly contribute to public health literature by exploring the mechanism of how different factors influence patient e-health literacy in OHCs and further contribute to e-health literacy literature by verifying the impact of social environmental factors.

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Adolescents tend to be enthusiastic users of social media, raising questions as to how time spent online affects their psychological well‐being. This entry reviews the literature on the links between adolescents' social media use and two categories of psychological well‐being: intrapersonal (self‐esteem, body image, self‐concept clarity) and interpersonal (social sharing, social capital, social support). Findings reveal that what adolescents do online matters, with some online activities having positive repercussions on well‐being, while others have negative repercussions. On the positive front, constructing profiles and receiving social feedback on social network sites boosted adolescents' self‐esteem and reflected their attempts to achieve self‐concept clarity, sharing positive news via social media boosted positive affect, active postings and passive consumption on social network sites enhanced social capital, and participation in online discussion groups provided social support. On the negative front, cyberbullying damaged adolescents' self‐esteem, attempts at achieving self‐concept clarity through online interaction were not always successful, and social comparisons with peers on social network sites reduced self‐esteem and increased body dissatisfaction. Implications for theorizing on how social media activities impact adolescent well‐being are discussed.