<http://schema.org/url>
<http://www.businessweek.com/articles/2013-06-14/a-private-search-engines-prism-boost-isnt-quite-its-breakout-moment>
<http://www.bloomberg.com/bw/articles/2013-06-14/a-private-search-engines-prism-boost-isnt-quite-its-breakout-moment>