Reading the other comments, it looks like your biggest problems are false positives. It might not be a bad idea to put together some kind of feedback mechanism

Reading the other comments, it looks like your biggest problems are false positives. It might not be a bad idea to put together some kind of feedback mechanism - in the event that I disagree with the sentiment/tags/categories that I could provide better ones and you could eventually use that data to refine your algorithm. That being said, this looks really cool and full of potential, now I just need a reason to be auto-generating that kind of meta data.