Abstract
This study explores the determinants of members' participation intention in online health communities (OHC) from both the facilitators and barriers points of view. From the facilitators perspective, each member's subjective well-being plays a crucial role in sharing intention. On the other hand, from the barriers point of view, social network site exhaustion would negatively affect. The survey was conducted on two online support groups, including parents of children with autism spectrum disorder and caregivers of dementia disease. This study collected 330 questionnaires from social network sites to examine the research model. The results showed that social support positively affects members' self-efficacy; in turn, self-efficacy has a positive effect on subjective well-being. Overload has an impact on psychological distress. Moreover, members' subjective well-being determined their knowledge sharing intention.