<http://schema.org/url>
<http://mashable.com/media/ZgkyMDEyLzEyLzA0L2VjL2RpZ2d0cmllc3RvLmRTSC5wbmcKcAl0aHVtYgkxMjAweDYyNyM/37a6325b/cd9/digg-tries-to-get-more-relevant-with-recommendation-engine--569f37eee9.png>
<http://mashable.com/2008/06/30/digg-recommendation-engine/>