Genealogy is the study of family history and ancestral lineage, tracing relationships across generations through records and narratives. The digital revolution has shifted genealogical research from traditional archives to online platforms. Grounded in knowledge co-creation theory, this study examined the role of social media communities and their managers as knowledge hubs within the genealogical ecosystem. Its central innovation lies in identifying two emerging actors in modern genealogical knowledge ecology: the online community as a hub of expertise and the community manager as a key figure in knowledge creation. Drawing on interviews with fifteen Facebook managers of genealogical communities from diverse Jewish backgrounds worldwide, the study explored their perceptions of online genealogical spaces and their roles as facilitators of knowledge. Participants demonstrated a high level of professionalism and thoughtful engagement with sources; however, verifying the accuracy of genealogical claims was not within the scope of this study. Interviews were conducted in English and Hebrew based on participant preference. Thematic analysis revealed five key areas: two focused on the community’s role as a knowledge hub for both members and outsiders, and three on the manager’s role through self-perception, member engagement, and strategic initiatives. As part of a broader dissertation, this chapter deepens understanding of collaborative, community-driven genealogical knowledge in the age of social media.