<http://schema.org/about>
"There were 25 billion 140-character tweets sent out in 2010, and more of them were concerned with the BP Gulf Spill than any other topic. Twitter has just released its list of the top 10 tweets for 2010, and it's a pretty"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/culture/bp-gulf-spill-the-1-twitter-trend-in-2010.html>