Fellow SEO Matt Hapburn and I have been working night and day since the update hit, in order to determine what actually happened. After six days of non-stop digging and analysis, we compiled this hot-off-the-presses Essential EMD Survival Guide that will teach you:
What kind of EMD sited were hit, and why
What kind of non – EMD sited were hit, and why
The factor that was helping your site rank, and that no longer works for your site
What the extra penalty is that Google applied to all sites that lost the above factor
And much more