Blogs across the web have slowly been integrating Facebook's commenting system into their blogs. The practice has become so popular that popular Content Management Systems like Drupal, WordPress and Joomla all have modules that quickly let bloggers replace stock commenting modules with Facebook's system. Even TweakTown uses Facebook's commenting system.
Seeing the success that Facebook has had with this, today Google has announced that it has begun allowing Blogger users the ability to integrate Google+ Comments into their blogs. Unlike Facebook comments, this new integration will allow users to set deep permission restrictions on who can see comments.
Users will be able to set permissions to individuals, circles or the general public. Blogger will also display discussions on Google+ that pertain to a user's specific post. Meaning that if a public discussion about your post pops up on Google+, those comments can also appear on your blog post.