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If this is so, I think I'll join Planet13 and open a pizza store...
that was hit by Penguin AND received an "Unnatural linking" warning via GWT
Two of my sites got hit by Penguin, but neither has ever received an unnatural link profile warning
there was an unnatural links warning, and that often comes just before a manual penalty.
I still think there's a strong correlation between an un-natural backlink profile and Penguin.
But are you sure the drop coincides with the date for Penguin?
Why did some sites get the warning but others didn't?
if a site has 100 inbound links and 95 of those come from one site (say, a site-wide footer link) with the same anchor, could that disrupt the link profile?
95% of inbound links coming from a single site, I cannot see how that's natural :)
She can ask for it to be removed but it actually brings some quality traffic