Currently, you have the option that you can easily share your videos that you watch on YouTube with your Google+ friends and within Google+ Hangouts. You also have another option that you can see which videos your friends are viewing directly from YouTube.
Well, this new feature has been added for Google+ users who didn't have YouTube channel yet. Well, if you already have Google+ and YouTube channel then they both are already integrate with each other if you have opened with the same email using Gmail.If, like most long-time YouTube users, you already have your own channel, YouTube says to “stay tuned.” We hope that means that you’ll eventually be able to link or associate your existing channel and Google+ account.
It would be so great if the videos get liked or commented on YouTube could surface in the Google+ notifications area.
The continued pairing of Google+ and YouTube is unsurprising. No matter how Google tries to spin reports of low Google+ usage, the service is still struggling to break out. Meanwhile, YouTube is the most social site and community that Google has. It makes sense to try to integrate the two experiences as much as possible.
One suggestion: Consider allowing existing users on YouTube and Google+ to create secondary YouTube channels. It would be even better if these channels could exist within current Google+ circles — so videos that I share, add to playlists or upload would also get shared with people inside a specific Google+ circle.