The box will show comments posted by people you follow and yourself:
We have also added "Your Shared Items" and "Your Starred Items" to the wall. You can access them by a single click or with the keyboard shortcuts "g then shift+s" and "g then s" respectively.
Update (Version 1.1.1): You can customize whether to show the special squares such as Friend's Shared Items. The settings are available in the option page:
By default only the Friend's shared items are shown. You can add more squares for quick access. Hope you like it!