Even if you’re not buying links, you can still get affected by the Penguin Update. This isn’t an update about whether you are buying links or not buying links. This an update about how you’re trying to manipulate Google.
That’s the whole idea of Penguin Update.
The intended function is to penalize sites that:
Once a week or so we send an email with our best content. We never bug you, we just send you our latest piece of content.
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