<http://schema.org/thumbnailUrl>
<http://www.imore.com/sites/imore.com/files/styles/thumbnail/public/field/image/2014/04/presentation_apps_ipad_hero.jpg?itok=PUAvrlWW>
<http://www.imore.com/best-presentation-apps-ipad-keynote-powerpoint-haiku-deck-and-more>