My sites card pages validate: http://www.scrapbook.com/galleries/1152/view/3934907/-1/0/1.html
They work with your checker too.
Yet, I just got an email after a month of waiting saying they do not validate.
When I try and reapply again, the field to fill in Website Twitter Username is greyed out. And when I try and submit the form it says “Website Twitter Username” is required. Bout ready to team my hair out over here on that one.