You can add comments to your blog via Facebook Comments plugin.
You can connect the comment plugin with your username or make a separate application for it which gives you the opportunity to share the moderation rights with other Facebook users.
If you choose to use the username method, just add your Facebook username (the one found from the address bar when accessing your profile) to settings.
Please note, that after you have linked your Facebook user account OR app to your articles, you need to publish your site before the Comment box is added under your articles. If the comments’ box is not there after successful publish, check that the visibility of the Comments element is turned on in article’s settings.
Link to moderation tool appears above the Comments when you are logged in to your Facebook account.