Inboxes
Inboxes are containers for all activities. Every user has a personal inbox. You can create generic inboxes for groups or roles and assign users to the inbox.
Creating inboxes
Go to any Settings > Account Settings > Inboxes. Click on the "plus" in the top right corner. It will create a new, empty inbox. You can change the name and assign members.
Once you have assigned an inbox to a member the user will see the new inbox in their sidebar.