<http://schema.org/alternativeHeadline>
"Twitter Ads service is now available to any user in the US for buying promoted accounts and tweets"^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/twitter/2013/04/30/twitter-ads-service-is-now-available-to-any-user-in-the-us-offering-promoted-accounts-and-tweets/>