There is no doubt about it: link building has evolved. In fact, things have changed so much over the years that link-building techniques that were effective even a few years ago are already completely out of date.
Link building has always been evolving, but the recent Panda and Penguin updates from Google took things to another level. Panda targeted low-quality, thin content masquerading as useful information, whereas Penguin targeted unnatural links.
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