Do members share knowledge in facebook knowledge groups?

People are getting used to interact with friends, search information, and even go shop on Facebook. It is reported that there are 1.4 billion users and 0.86 billion active users per day on Facebook. Many knowledge groups are created on Facebook for sharing knowledge and exchanging opinions and experiences. This study expects to figure out determinants influencing members’ sharing behavior of contribute their own knowledge in Facebook Knowledge Groups based on the perspective of psychological ownership. Research model is developed based on the perspective of psychological ownership and the justice theory. An online survey was conducted for data collection. Three hundred and sixty-two usable data were analyzed. Results show that organization psychological ownership positively affects members’ knowledge sharing behavior. Trust towards other members and relational embeddedness of knowledge groups positively affect organization psychological ownership. Relational embeddedness and perceived equity towards knowledge groups positively affect members’ trust towards other members. The construct of equity is a secondary order constructs and consists of distributive, procedural, interpersonal, and information justice. All four sub-dimensions are significant. Results show that interpersonal equity is especially important and the importance of other three dimensions is almost the same. Implications are discussed.