Cross-posted from the Google Official blog
Posted by +Yonatan Zunger, Principal Engineer
In all cases, you and your readers will only see the comments you have permission to see. Giving people these kinds of controls not only encourages more meaningful sharing—it can lead to more blog traffic.
You can also visit any post on the Official Google Blog (like this one), or on Blogger Buzz (like this one), to see Google+ Comments in action.