<http://schema.org/headline>
"Now counting 6.2 million daily, Foursquare has crossed the 3 billion check-in mark"^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/location/2012/11/21/foursquare-has-its-3-billionth-check-in-seeing-growth-of-x/>