<http://schema.org/topics>
"blogging,BLOGS,Business,Business Lists,comment moderation,comments,contributor,enterprise,features,html,Lists,Programming and Web Development Lists,Small Business,Social Media,social media marketing,social networking,web 2.0,web development,widgets"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2010/02/16/social-media-enterprise-tips/>