Starting last week, you’ll see the new YouTube comments powered by Google+ on your channel discussion tab.
Comments you care about move to the top: You’ll see posts at the top of the list from the video’s creator, popular personalities, engaged discussions about the video, and people in your Google+ Circles.
Join the conversation publicly or privately: You can choose to start a conversation so that it is seen by everyone on YouTube and Google+, only people in your Circles or just your bestie. Like Gmail, replies are threaded so you can easily follow conversations.
Better ways to moderate comments: You have new tools to review comments before they’re posted, block certain words or save time by auto-approving comments from certain fans. These can help you spend less time moderating, and more time sharing videos and connecting with your fans.