Share documents and citations with others by inviting them to participate in the group. With the basic Mendeley plan, private groups can only have 3 members and 100 MB of storage space for group resources. These private groups are visible only to members, who can share papers and notes.
Public groups that are invite-only
These publicly visible groups have a restricted membership list, which is controlled by the group's owners. You can upload PDFs, but they will only be available to others if they have access through their own institutions (or if they are Open Access articles).
Public groups that are open
These are publicly visible and everyone can contribute citations. Great for open discussion groups around any subject.