<http://schema.org/alternativeHeadline>
"Twitter now has 200 million monthly active users, up 60 million in 9 months"^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/twitter/2012/12/18/twitter-now-has-200-million-monthly-active-users-up-60-million-in-9-months/>