We haven't been hearing a whole lot about Blogger amid all the changes at Google in recent months, but the company hasn't entirely forgotten about the pioneering blogging platform it acquired way back in 2003. It's today introduced Google+ Comments for Blogger, a fairly self-explanatory new feature that will let you bring G+ comments to your Blogger-based site. Blogger users can enable that feature in their dashboard, which will let them see both comments left directly on their blog and those made about their blog on Google+. Notably, it will also let users chose to either comment publicly or privately to only those in their Google+ circles -- and, conversely, choose to only view comments from their circles instead of the teeming masses.
Source:Official Google Blog