Groups come in a variety of types and the process of creating them differs depending on their type.
- A group that anyone can join.
- The owner of the group determines who is allowed to post to such a group.
- A group that people apply to join.
- Applications are adjudicated by the group administrator(s).
- A group whose membership is fixed by one of a number of processes.
- Many of the closed groups are created thru the same automatic processes that are used to create Listserv lists.