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I can confirm that 70 of our sites were hit over the weekend. It started happening about Thursday of last week. Some of the sites were number 1 for keywords and now they're off the chart. But honestly, the sites were of low quality and we have been advising the client for some time about over optimisation so this comes as no surprise. Other sites we deal with who also have EMD have been unaffected. There's a lot of pissed people out there after this one. They could've at least named it after another back & white animal!

In addition to Malcolm's suggestions, just be sure you follow the guidelines to the letter to avoid penalties. That's very important.

Well I will call myself as one of the neutral person who nether got hurt not got any positive advantage out of it! The reason why there was no real movement is because my industry is very competitive and the terms I am targeting are the most competitive terms in my niche… Moreover, our website is standing mostly on 2 to 3 page and almost all competitors are investing right on SEO so the spam links and similar ratio is quite down at my side… and everyone is busy building quality links to the website. In these cases usually the one with most quality score wins! As far as Penguin is concern… well may be its new in the bubble further versions of it will might bring a penguin with a Matt’s face on it