2.
In 2011 Google introduced the Panda update to its ranking algorithm, significantly changing the way it judged websites for quality. Google started by using human evaluators to manually rate thousands of sites, searching for low quality content. Google then incorporated machine learning to mimic the human evaluators. Once its computers could accurately predict what the humans would judge a low quality site, the algorithm was introduced across millions of sites spanning the Internet. The end result was a seismic shift that rearranged over 20% of all of Google's search results. For more on the Panda update, some good resources can be found here and here.
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