I’m not sure exactly how to tell what “post type” it is. It’s a regular post as far as I know and it’s NOT a page. I’m going to POSTS > ADD NEW and just publishing from there on a pretty new WordPress installation. I didn’t create any custom page types.
When I used the Facebook application to scrape my site, the resulting code appears to recognize me as an author and it did see the Author URL. I tested by lowering my role to “Author” instead of “Administrator” but it didn’t change the blank field when posting to Facebook.