As the Steelers and Cardinals battled on the field, Twitter users across the nation pecked out a steady stream of "tweets." The map shows the location and frequency of commonly used words in Super Bowl related messages.
It's kind of like a tag cloud (which I usually detest) reimagined. It's a neat visualization and use of Twitter that I predict will become rather popular going forward. (The paucity of tweets coming out of Montana is hard not to notice: the only words that bubble up are "springsteen" and "awful.")