Google has just added a feature for their Blogger that allows visitors to post comments using their Google+ account. Even though Facebook is the most popular social media online, Google+ has still a fair share of users. If you add Google+ comments to your blog, you’ll see an increase visibility of your website because these comments are published to their walls or timelines automatically. And since most people already have Google+ signed in to their computers, they don’t need to fill forms.
However, there is no official plugin yet for Google+ comments in WordPress. Which means that some features are lacking like comment notification. And since this is not an official plugin Google might shut it down, but it’s not likely to happen at this time.
Read the rest of the tutorial here: http://www.wpbeginner.com/plugins/how-to-add-google-comments-in-wordpress/