Example:
I subscribe to a tag feed or blog search and the tag/search term is ‘green-rabbits’. I know spammers use this tag which is why I’m following it but then I discover that you also use that tag, and so do a dozen other blogs that I know are good, not spam. So what I want to see is the tag results minus good blogs. I want it to download whatever it finds but then remove what I have determined are the good blogs.
I cannot find such a program and I do not think it exists or does it?

Alternately I have looked at something like Feedwordpress to see if I can exclude by url. I’m sure the spammers will have this all worked out but if there is a script I don’t know what it’s called. I could then use the blog posts as the material I need.