<http://schema.org/topics>
"2011,analytics,Business,Business Lists,campaigns,news,contributor,email,features,Lists,Marketing,marketing lists,metrics,predictions-2011,Social Media,social media marketing,trending,YouTube"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2010/12/28/social-media-marketing-predictions/>