<http://schema.org/url>
<http://thenextweb.com/apps/2012/11/16/more-reasons-not-to-use-flickr-anymore-500px-adds-creative-commons-licensing/>
<http://thenextweb.com/apps/2012/11/16/more-reasons-not-to-use-flickr-anymore-500px-adds-creative-commons-licensing/>