<http://schema.org/url>
<http://www.phonedog.com/sites/phonedog.com/files/blog/main_image/2014/03/181425-main-large-twitter-improves-photo-sharing.jpg>
<http://www.phonedog.com/2014/03/26/twitter-adds-photo-tagging-support-for-up-to-four-photos-in-a-tweet>