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Google+ notifies you about hangouts in several ways, each of which enables you to easily join the hangout. When someone in one of your circles is hanging out, Google+:
• Displays a post on your stream. Click the Hang Out button to participate. Figure 12.8 shows a sample post for a hangout.
Figure 12.8. Learn about hangouts from your Google+ stream.
• Sends you a notification. Click the Notifications button in the upper-right corner of any Google+ page, click the right arrow on a hangout notification, and click the Hang Out button to join (see Figure 12.9).
Figure 12.9. Join a hangout with the click of a button.