New Notifications Center
We’re starting to roll out a new notifications center on the Google+ Web experience. Within it you can mark all notifications as read, quickly scan by notification type (comments, +1s, reshares), and filter all your notifications by All, Unread, and Other Updates. These filters are also available today on the Google+ iOS app.
This new Notifications Center our first version, with lots of updates to come. As such, please send us any ideas/issues using the Send Feedback menu item to ensure we see them.