fathom - 6:38 pm on May 27, 2013 (gmt 0)
Then you really need to read up on random sampling - like I say, many sources whose experiences matched my own were unrelated to me, plus there's the added randomness of various developers having all kinds of clients who are not related to one another in anyway (same with my own clients too). When you add it up, it's a large random mix of thousands of sites. BUT...."pretty much, yep" they are all somehow related to one another - granted, statistically this is possible in the same way you may win the lottery twice in a row, but I'd (understatedly) say it's unlikely that you are right.
And yet again, the random sample begins with a constant... PENGUIN 2.0 targeting link webspam.
I have yet to see a single website negatively impacted that did not have something to do with links.
If you have a domain the does not have something to do with links - point it out - it is a false positive and Google would love to fix your issue immediately.