There are four different types of Users that you can create in Shelf. As an Administrator, you can assign different roles to the users you add to your account:
View-only (not available on all plans)
Can view, tag and comment content. Cannot add or edit content.
Can view, create and edit content. Can tag and comment content. Does not have a Private Library and cannot create Group Libraries and Folders.
Collaborator (formerly User)
Can view, create and edit content. Can tag and comment content. Has a Private Library and can create Group Libraries and Folders.
A Collaborator can assume the role of an Admin for specific Group Libraries so that group members can be managed by the Collaborator. Likewise, a Collaborator can assume the role of a Member for specific Group Libraries to restrict the curation of content as Members cannot create Folders.
Can do all a Collaborator can. Can also administer the Shelf account, can add users, change subscriptions and analyze account usage.