User and group management

In personal or business computing, a user group is a set of people who have similar interests, goals, or concerns. The members have regular meetings where they can share their ideas.

Ideally, the members of a user group live in the same geographic area, so they can get together in person. However, some user groups have members distributed throughout the world, and they meet using Internet chat rooms, message boards, or mailing lists. Members may also correspond by telephone and e-mail on a one-to-one basis. User groups often have Web sites that each member can visit on a regular basis to stay informed.

http://whatis.techtarget.com/definition/user-group