<http://schema.org/alternativeHeadline>
"Gnip releases Automattic PowerTrack, making social data less noisy on WordPress.com and more"^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/insider/2013/02/07/gnip-releases-automattic-powertrack-simplifying-social-data-filtering-on-wordpress-com-and-more/>