Understanding relationship commitment and continuous knowledge sharing in online health communities: a social exchange perspective

Purpose Online health communities (OHCs) have become increasingly popular sources of health information in recent years. However, little is known about the factors that affect the relationship commitment and continuous knowledge sharing intention among OHC members. Thus, this study aims to integrate social exchange and commitment-trust theories to establish a theoretical model to fill the gap. Design/methodology/approach A research model that integrates social exchange theory and commitment-trust theory is developed. Quantitative data from 519 valid questionnaires are collected via an offline survey. Statistical product and service solutions 20.0 and analysis of a moment structures 20.0 software are used to test the hypotheses. Findings Relationship commitment directly influences continuous knowledge sharing intention, partially mediates the relationship between social support and continuous knowledge sharing intention, and fully mediates the relationship between perceived health risks and continuous knowledge sharing intention. Informational and emotional supports are identified as benefit factors that positively affect relationship commitment and perceived health risks are regarded as cost factors that negatively influence relationship commitment. Informational and emotional supports of OHC members produce different effects on relationship commitment when members obtain social support from different sources. Moreover, trust moderates the influences of informational support and perceived health risks on relationship commitment. Originality/value The findings provide additional insights that can augment the knowledge management literature by indicating how people are driven to share knowledge continuously in the context of OHCs. This study empirically clarifies the relationships of benefits (i.e. social support) and costs (i.e. perceived health risks) to continuous knowledge sharing intention by demonstrating the significant mediating effect of relationship commitment. In addition, the findings of this study highlight the importance of the social support source in OHCs and provide additional insights into commitment–trust theory by integrating the moderating effect of trust on the relationships between relationship commitment and its antecedents.