There is a direct link to the page in the digg bar itself and when clicked, the "fuck you" message remains (the digg bar disapears). Does the referrer change depending on which frame the request comes from?

the link is in the context of the digg domain, so if you click it, even though the bar is no longer present, the referrer (or should I say referer) will still be digg.com. interestingly, if you ctrl-r, the same HTTP_REFERER header will be sent. but ctrl-l, cr will blank the header & you'll get the regularly scheduled content.