I feel like yelling "been there, done that".

This is old. Sooo old.

However. Before you invest in this company. You have to realize that analyzing the sentiment reflected in a text is no trivial matter. People get English degrees while studying this topic.

There is no way in h*ll software can do anything but some probabilistic tagging which will be often wrong.

If you think this might still be useful, you have to watch out. Basing decisions on hard data is already difficult enough (should I invest in my portfolio or pay my house?), I don't think we are nearly sophisticated enough to do anything useful with sentiment analysis.

Of course, please, prove me wrong.