Anyone can post a comment on a caption on a site, either logged in to Google+ or a network site, or anonymously by typing in the comment field without logging in.  I monitor all comments manually, and post material that is relevant to the site or the material.  I reserve the right to omit any comment which I consider spam, or offensive.  However, you can criticize me all you want, just be polite about it.  You can list your blog or site url in your comments!