Twistori, according to the site, is the "first step in an ongoing social experiment." The brainchild of Amy Hoy and Thomas Fuchs, Twistori pulls tweets from Twitter (via Summize) containing specific keywords: i love, i hate, i think, i believe, i feel, and i wish. In then publishes the tweets it finds anonymously in a non-stop, auto-updating river of news. The result is a continuous stream of feelings from the Twitter community.
It's not clear from the site what the second step in the experiment is, but Hoy and Fuchs say that the project was inspired by We Feel Fine, which aggregates feelings from a large number of blogs and social sites. We Feel Fine created a number of explorable data visualizations based on the feelings it gathered, and used it to draw some interesting broad conclusions.
That could certainly be a next step for Twistori, which right now presents a stream of consciousness view of the Twitter emotional landscape. Because the project comes from Hoy and Fuchs, it draws heavily on Prototype and is stunningly designed.
Be cautioned: watching the feelings of anonymous Twitter users scroll by can be strangely addictive.