Semantic Analysis predicting stock markets?

I have been seeing more than a few articles lately about the use of Semantic Analysis, specifically Sentiment Analysis, in predicting stock market changes. Moods can move markets and tracking moods online may give the tracker an advantage in stock picking.
What do you think?

Could be a fad - seems quite shallow of analysis, but if it starts working for some, will the rest of the herd quickly follow?

Grab an API Key
Request a Demo