The Hangouts page on web version of Google+ now gets "People you know" card. It will list different people in your circle you haven't been involved in discussion with through Hangouts, video calling service, or Google's instant messaging. A "start conversation" button will appear next to the name of these people, which upon clicking will open a chat window.
The update also comes with two other cards: Video Hangouts and Hangouts On Air. To check out the card, all you need to do is tap on "Hangouts" present in the Google+ navigation menu on the left. You can also go to plus.google.com/hangoutsGoogle+ Hangouts Gets "People you Know" Card!,