<http://schema.org/keywords>
"facebook"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2011/08/27/digital-media-resources-30/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A%20mashable%2Fsocialgood%20%28Mashable%20%C2%BB%20Social%20Good%29&utm_content=Google%20Reader>