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Of course, it could be for sticky notes... You can also see though that on your Home page, you'll now see a trending on Google Plus display, shades of Twitter's trending feature.
Google has also made Google Plus a lot more graphics friendly. How friendly? It now includes a basic photo editor in its goodie bag. That shot, by the by, is of me in the press box at Boston's Fenway Park.
Google's circles interface, remains basically the same.