In one aspect, a computer-implemented method of associating tags with online content may generally include receiving, by one or more computing devices, a tag request from a user to associate a tag with a content object, classifying the tag as a controlled tag, accessing an access control list associated with the controlled tag, determining whether the user is permitted access to the controlled tag based on the access control list, associating the tag with the content object when the access control list permits access to the controlled tag, identifying a moderator for a tag group associated with the controlled tag and providing a moderator feed to the moderator of the content object associated with the controlled tag for approval or rejection of the controlled tag.