"Shluvim" is a professional social network (hereinafter: PSN) in Israel. It serves as a space for educational professionals to collaborate and share knowledge, empower their professional development and receive emotional support. We aimed to characterize the groups operating in this network and the role played by the groups’ leaders over the first four years of its operation, investigating motives for the groups’ creation and the extent of group activity and created a model for policy-makers and members of PSNs. Qualitative-phenomenological and quantitative data gathered from 16 semi-structured interviews, and a focus group indicated different rates of participation in the groups, distinguishing open and closed groups and identifying motives for their creation. The findings indicate the importance of social networking groups for members' personal and professional development, the importance of the group managers’ activity, and reasons for a group's success or failure. Group members’ noted recommendations for successful group management.