Google Blog: “For many people, Google Search is a place they go when they want to find information about a question, whether it’s to learn more about an issue, or fact check a friend quoting a stat about your favorite team. We get billions of queries every day, and one of the reasons people continue to come to Google is they know that they can often find relevant, reliable information that they can trust. Delivering a high-quality search experience is core to what makes Google so helpful. From the early days when we introduced the PageRank algorithm, understanding the quality of web content was what set Google apart from other search engines. But people often ask: What do you mean by quality, and how do you figure out how to ensure that the information people find on Google is reliable?…”