The Inbox is where all of the activity you’re participating in resides. In addition to that it also shows direct social actions (shares, @mentions and messages) as well as some action notifications like when someone follows you. Selecting an item in the list will populate the content in the bottom view. This interface is fully interactive in that you can share, reply and navigate to the content.
The Inbox has a few options to allow you to filter the information you’re viewing:
Unread Only: similar to an email inbox you can choose to see only the unread updates only.
Mark all read: marks all updates as read
Filter By Type: @mentions, messages, shares and notifications
Filter By Participant: type the user’s name to filter out who the update involved