tedster - 12:07 pm on Sep 26, 2012 (gmt 0)
In my experience it is more about over optimisation than spam.
In recent Google-speak, those two are the same thing. And yes, that is Google's admitted target with Penguin, rather than "shallow" content which is Panda's target.
We're going through a language change at Google. There now is no such thing as a "penalty" in their language, but only manual actions and algorithmic evaluations. Also any site that is ranking well due to over-optimization is often being called "webspam". The algorithm currently demotes those rankings more than simply zeroing out the effects of over-optimization.