When you are administering a Tabbles network with many users, you want to spare your users the burden of creating tags, and putting them in a hierarchy. With Tabbles, the administrator can do all the work. He can create a hierarchy of tabbles and share it with all (or some) users. Ordinary users will see the tag hierarchy and will be able to start tagging files immediately.
Support user-level permissions
Support tag-level permissions
Support group-level permissions