Google added a new feature for Google+: watching the Youtube’s live video from Hangouts.

This feature is still not fully launched, if want to have a try, you need to manually paste the live video’s Live ID into Hangouts.

When you on the Google+ page, paste the video ID to Hangout window, which makes every person in the Hangouts are able to watch live simultaneously.

But it is only effective to live video, not the other Youtube video, where the concept here is to do a live experience, for example now there is a NBA live, you can call a few friends together to watch, as the same we sat together in college dorm room.