<http://schema.org/about>
"The Wall Street Journal has a treatment of several digital media-swapping websites that's worth a look for anyone that has a few CDs, DVDs or games collecting dust. Instead of receiving cash in exchange for the aging media, members collect points that"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/sustainable-product-design/virtual-swap-meet-for-digital-media.html>