TweetPsych

Anyone can read the posts that anyone has placed on twitter. Thus there are applications like TweetPsych, which you can use to analyze what you, or anyone else on Twitter has said, without their permission. The results for me seemed to be reasonable, though how precise and usable is hard to determine. Other related analysis tools.

' ... TweetPsych uses two linguistic analysis algorithms (RID and LIWC) to build a psychological profile of a person based on the content of their tweets. The service analyzes your last 1000 tweets and works best on users who have posted more than 1000 updates. It also works best on accounts that are operated by a single user and use Twitter in a conversational manner, rather than simply a content distribution platform. For more information read the blog post or follow the creator Dan Zarrella ... '