<http://schema.org/url>
<http://www.businessweek.com/articles/2012-04-05/online-porn-is-huge-dot-like-really-really-huge-dot-who-knew>
<http://www.bloomberg.com/bw/articles/2012-04-05/online-porn-is-huge-dot-like-really-really-huge-dot-who-knew>