<http://schema.org/url>
<http://thenextweb.com/apps/2011/12/20/track-your-weekly-carbon-footprint-using-foursquare/>
<http://thenextweb.com/apps/2011/12/20/track-your-weekly-carbon-footprint-using-foursquare/?awesm=tnw.to_1CJpZ>