Spam detection using historical factors

This post is from from my other blog here

A Google guide to spam detection We all know your friend an mine Matt Cutts, over at the Google Web Spam team… but how exactly do they go about detecting and curtailing web spam? While there are a wide variety of tools at their disposal, historical factors are easily one of the more powerful methods. In the last offering in our series on historical ranking factors, we’re going to look at some ways they are used to detect spam. Now, this isn’t an education for spammers in as much as I wanted to give everyone some knowledge in hopes they aren’t needlessly flagged for earnest efforts.