Psychologist James Pennebaker Counts, and Analyses, Words
James W. Pennebaker’s interest in word counting began more than 20 years ago, when he did several studies suggesting that people who talked about traumatic experiences tended to be physically healthier than those who kept such experiences secret. He wondered how much could be learned by looking at every single word people used even the tiny ones, the I’s and you’s, a’s and the’s.
http://www.nytimes.com/2008/10/14/science/14prof.html?partner=permalink&exprod=permalink