To make it easier for you to find coworkers, add them to Circles, and share things with them on Google+, Google’s adding new domain labels. When you hover over someone’s name or photo, a window will show with more information. If that person is part of your organization, you’ll see a label below their name with your organization’s name. You’ll see this same label when you +mention a colleague in a post or comment.
Note: This feature is only visible for people in your company so you can make sure you’re connecting with the right person.
For more information
http://support.google.com/a/
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