Google Hangout upgraded into a messenger by itself

Google has recently upgraded it's Hangout feature. You can now see a list of friends who you were hanging out with in the place of your old Gmail chat.

Where did my Gmail Chat friend list go?

While you are viewing your Hangout list of friends you will not be able to see your gmail chat friends who are currently online.
You can put your pointer on the icon below the list to see if you are viewing your friends whom you hung out with.

How do I close or sign out of Google Hangout?

Click on the drop-down arrow next to your name and click on Sign out of Hangouts.

How do I sign into Google Hangout?

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