Online health communities (OHC) provide a platform for users to exchange health-related information and seek emotional support. However, users often lack the intention to share their knowledge, which may lead to the failure of OHC. Drawing on the social influence theory, this research examined OHC users’ sharing behaviour. The results indicated that users’ sharing intention is influenced by three social influence factors, which include subjective norm, social identity and group norm. In addition, social support and privacy concern have effects on these three social influence factors. The results imply that OHC need to leverage social influence in order to facilitate users’ sharing behaviour.

在线健康社区（OHC）为用户提供了一个交流与健康相关的信息并寻求情感支持的平台。但是，用户通常缺乏分享知识的意图，这可能会导致OHC失败。本研究基于社会影响力理论，研究了OHC用户的共享行为。结果表明，用户的共享意愿受到三个社会影响因素的影响，包括主观规范，社会认同和群体规范。此外，社会支持和隐私问题也会影响这三个社会影响因素。结果表明，OHC需要利用社会影响力来促进用户的共享行为。