After Penguin 1.0 was released, Google also explained that a Panda update was rolled out a few days before Penguin (on 4/19). Then, to make matters even more confusing, Google rolled out a Panda refresh on 4/27. To quickly recap, Panda rolled out on 4/19, then Penguin on 4/24, and then a Panda refresh on 4/27. Yes, that’s essentially an algo sandwich special, with a side of insanity. As you can imagine, webmasters that aren’t extremely familiar with SEO could very easily think they were hit by Penguin (since that was the primary topic during the time period).