I found this fascinating quote today:
TweetPsych uses two different analysis algorithms–Regressive Imagery Dictionary and Linguistic Inquiry and Word Count) to create a psychological profile for you based on your last 1,000 tweets. Type in a username and TweetPsyche comes back with a profile of cognitive, primordial, conceptual and emotional content of your Tweets.Janet Fouts, Jun 2009
You should read the whole article.
