<http://schema.org/url>
<http://www.joystiq.com/2012/05/01/psa-the-7th-guest-free-on-ios-and-mac-app-store-today/>
<http://www.engadget.com/2012/05/01/psa-the-7th-guest-free-on-ios-and-mac-app-store-today/>