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Swiping your finger across the screen from right to left will change the view of your stream to something unique to the Google+ iPhone app: incoming messages from people near your current location.

Swiping your finger once more from right to left will change the stream view to "Incoming," which includes posts from everyone who has put you in a circle.

At the top right of the app you'll see two icons: a checkmark and a pencil. Tap the checkmark to load a list of locations near you and check in.