I'm sure there is, but there is an enormous corpus of data, and any filtering you add can end up impacting the legitimate sites you're trying to get to. SEO sp

I'm sure there is, but there is an enormous corpus of data, and any filtering you add can end up impacting the legitimate sites you're trying to get to. SEO spam is constantly adapting to changes in filtering. If you start filtering sites that have a table of contents, SEO spam will remove their ToC in no time, but authentic blog poster will probably not. Real content producers don't have the time to chase every change to google's algorithm but SEO spammers do. How do you filter out the spammers who adapt to changes without affecting the real content producers who can't afford it? I promise you, the problem is harder than you realize. And sure as shit a lot harder than "just add a bayesian filter and these 3 hard coded rules I just came up with"