Thought I would feedback on something I have discovered with Penguin.
We have discussed if penguin is site wide or page specific.
From my research I think its possible it could be neither. It appears to me that its the actual keywords that are penguined, rather than the page.
I have set up a new site and 301 redirected all of the pages except one page that fell very deep in the serps. I assumed that as this page was so deep it would be a bad idea to add a redirect as any penalty on the page (if the penguin hits the page not the domain) would be passed over.
Instead I added a 404 to the page in question and started a new page for the keyword term on the new site.
This new page is still not ranking at all. Now it could be possible there are many other factors preventing the page ranking but based on the domain previous success you would expect the page to rank somewhere decent if penguin is not site wide.
Rather interestingly I have created several totally new pages for the new site with keywords I have never targeted before. A few of these pages are ranking number 1 (within 2 weeks).
So this suggests to me that the penalty is certainly not site wide as it is very easy to rank new content. So if it was so simple to rank the new keyword content I would expect the new page for the old 404 page to rank also.
As its not ranking it looks to me like my site could be prevented from ranking for the keyword phrase that my site has hundreds of exact match links for.
This is not fact.... just an observation. Would love to hear thoughts on this.