Agreed. I think generating a more filtered list is possible - but would take significantly more time than it took to build the sentiment analysis tool.

The results of the more-filtered-list-tool would be quite interesting, though, as you'd essentially be modeling a set of "ideal leads" and determining how close/far a set of tweets are to those models. Just figuring out an "ideal lead" model for the segments you're targeting would be an interesting intellectual pursuit.

I think I might end up building this...