diberry - 2:58 pm on Jun 30, 2013 (gmt 0)
One of my informational sites was hit hard by Penguin, but has recovered some since Penguin 2. One thing that's obvious to me is that where I got hit was on money terms - terms where people spend money on Adwords. On the terms where people don't spend on Adwords, my sites continue to do fine.
My theory is that Google has two different ways of ranking pages, depending on whether the query involved is big in Adwords or not. This is NOT a conspiracy theory, but a reflection that spamming is more likely to happen on Adwords money terms than other terms, so if Google's main focus recently has been to fight spam, that's where you'll see changes.