There are three types of groups on the Commons: public groups, private groups, and hidden groups.
Public groups (like MLA Commons Help) will appear in the directory of groups, and anyone can join by clicking the Join Group button on the group’s page. All content in public groups is visible, even to people who aren’t logged in to the site.
Private groups will also appear in the directory of groups, but membership may be restricted in different ways. You will automatically be a member of your divisions and discussion groups and of any MLA committee that you serve on. To join another division or discussion group, add it by signing in to My MLA on the MLA Web site. To request to join other private groups, click Request Membership on the group’s page. If the request is approved, you’ll be able to view the group’s content.
Hidden groups won’t appear in the directory of groups, and their content is viewable only by their members. New members must be invited to join by existing group members.