The site shows comments from registered and unregistered visitors. What I wanted to ensure that the site can visit unregistered visitors currently logged on to their FB account and that they can leave a comment which will be displayed within the standard WP comments, but with an avatar from their FB account. No plugin that I tried could mix both wp and fb comments. The comments from the FB account is showing separately, which creates a problem because you can not follow conversations. So the most important to me is that WP and FB comments are mixed in one place. Thanks in advance for your help.