Have fun with this one.... We have enabled commenting on blog posts on afdc.com.
When you click on a post you should see a field at the bottom to leave a commnet. If you are already logged in to facebook you can simply enter a comment. If you are not you will be required to log in to leave a comment.
There is a checkbox in the field that will allow your post to show up on your timeline. If you do not want that simply uncheck the box.
In this case Facebook is a method for us to identify posters. Hopefully people will comment appropriately if they have to use their facebook account to do so. It should also cut down on spam. Pete or Chris can elaborate in more detail.