<http://schema.org/url>
<http://www.businessweek.com/articles/2014-07-28/no-skywriting-a-small-firm-s-pitch-to-put-hashtags-in-the-sky>
<http://www.bloomberg.com/bw/articles/2014-07-28/no-skywriting-a-small-firm-s-pitch-to-put-hashtags-in-the-sky>