<http://schema.org/about>
"Mother Nature Network is giving away some of our favorite green books to keep you busy by your favorite low-carbon fireplace this winter."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/lifestyle/arts-culture/stories/become-a-facebook-fan-of-mnn-and-win-a-shelf-of-great-eco-books>