I remember doing some research about this a while ago. Getting some sort of text-based emotional index isn't trivial at all, there are few hardly viable solutio

I remember doing some research about this a while ago. Getting some sort of text-based emotional index isn't trivial at all, there are few hardly viable solutions (google's prediction api and Bayes-based algorithms), but they aren't really accurate. This is also been tried in the past by startups of techcrunch fame such as stockmood.com, all failed miserably. Props to twitter or anyone who will succeed at this.