<http://schema.org/thumbnailUrl>
<http://www.imore.com/sites/imore.com/files/styles/thumbnail/public/field/image/2014/07/contacts_app_favorites_iphone_hero_fixed.jpg?itok=2ByADxjr>
<http://www.imore.com/how-assign-photos-contacts-your-iphone-or-ipad>