<http://schema.org/interactionType>
"http://schema.org/CommentAction"^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/insider/2012/12/03/a-worm-is-hijacking-tumblr-blogs-and-posting-spam-said-to-affect-thousands-of-accounts/?fromcat=all>