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What is the state of the art in sentiment analysis? I tried their demo page, and it seems completely useless (could not interpret the query "Not the greatest movie"). Are the algorithms used on Wall st. for predicting market behaviour based on twitter stream significantly more advanced?

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Colleagues of mine had a review paper on opinion mining published quite recently at this address if that is an interest of yours: http://link.springer.com/article/10.1007%2Fs13278-012-0057-9 or without paywall: http://ge.tt/8qDJWPT/v/0?c

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