This block was donated by WizardSys, the creator.
You can leave a comment on the site using your Facebook login or anonymously. This block uses a Facebook application which you have to create and is the biggest pain, although it is easy to do. Get the application id number and put it in your block and you are good to go. And if you use your Facebook login you can post your comment to your wall to. This is nicely optional in case you need to rant.