TweetPsych is yet another Dan Zarrella masterpiece. This time the product prefers to analyze the last ~1000 tweets from a single person that just does not pump news feeds into a Twitter stream. From there is does quite a bit of analysis:
…uses two linguistic analysis algorithms (RID and LIWC) to build a psychological profile of a person based on the content of their tweets
I ran it against myself as usual and never cease to be surprised by any results any of these services send back.