Community manager
A community manager is(are) the person(s) that lead the community. Among the community manager’s responsibilities are designing the community’s strategy, implementing it, managing the day-to-day community’s activities, providing support to its members and building connections, and growing the community.
In virtual communities spaces, such as Facebook and LinkedIn groups, or Slack and Discord channels, the community manager is the admin of the group or channel.
Note: I prefer the term community leader, since I believe that handling a community is more than getting things done or controlling it. It’s a two-sided relationship. Setting the community’s instrafructures, while motivating community members to participate and engage. The community leader must be attentive to what the community needs, and make changes accordingly.