Groups allow you to share references with colleagues or the public. Three types of groups are available:
Private: Not visible to the public. Share references and documents with other Mendeley users who you invite to the group. Only group members can view and edit the references. Free version of Mendeley limits users to 1 private group of up to 3 members, and 100 MB of shared web space.
Public, Invite-Only: Visible to the public. Share references only. Any Mendeley user can follow the group, but only group members can add references.
Public, Open: Visible to the public. Share references only. Any Mendeley user can become a member or follow the group.