It is called the Facebook Comments Plugin.
This is where you can find it to add to your blog if you want to try it out
Here’s what Facebook says about the plugin ~
“The Comments Box is a social plugin that enables user commenting on your site. Features include moderation tools and distribution.
Social Relevance: Comments Box uses social signals to surface the highest quality comments for each user. Comments are ordered to show users the most relevant comments from friends, friends of friends, and the most liked or active discussion threads, while comments marked as spam are hidden from view.
Distribution: Comments are easily shared with friends or with people who like your Page on Facebook. If a user leaves the “Post to Facebook” box checked when she posts a comment, a story appears on her friends’ News Feed indicating that she’s made a comment on your website, which will also link back to your site. Friends and people who like the Page can then respond to the discussion by liking or replying to the comment directly in the News Feed on Facebook or in the Comments Box on your site. Threads stay synced across Facebook and on the Comments Box on your site regardless of where the comment was made.”
I love the “post to Facebook” feature because it takes the viral effect to a whole new level for my blog posts. Not only do I get the benefit of the interaction of comments on my blog I get the added benefit of the comment being shared on Facebook for a whole other level of interaction.
The set up of the settings can sometimes be a little tricky to get it to look exactly as you want on your blog so let me know if you have any issues when you go to set yours up. Also I would love to hear what you think of it once you have started using it~ make sure to leave a comment with your thoughts!
To Your Success!
The Marketing Momma