Check out the section with the code. Not the nicest code I have seen. They seem to confuse the user agent with the referrer, and they encourage you to call the file "fftest.php". The JavaScript is silly, since they require PHP on the server instead of just doing it all in JavaScript, and I don't think it will even work since they are taking the referrer from the JavaScript file which should be the page that requested it.
I thought the same thing. Just post something annoying, and everybody will surf to your page to rant. Cheap... Especially funny is the domain name - why create a page for the sole purpose of blocking digg? Not very credible.
