i just got the report. i.e., http://twitter.com/1000free is considered ham by your app, looks like spam to me. maybe a feedback button would be appropriate (mark as spam/ham.)
Yes feedback is definitely needed to improve it! And to identify spam for other users with the same followers.
The only downside is that the request might take longer.
Btw, beware that some spam accounts use others tweets to look legit. I can send you some for example, if you're interested.