The idea of filtering exists within search engines. You must know what information you want to keep because it is important and what information you don't want to use because it is not what you are looking for. It is difficult to decide what pieces of information are important enough for you to want to view. Especially where there is no concrete way of testing the validity of a webpage or its content.
SEO Tune-Up Annual check-list of your site SEO strategy (Source: Sparkplug)
AuthorRank is Google’s attempt to analyze the influence and reliability of those who write blog posts, web pages, and the like. For the average writer, marketer or content producer, AuthorRank offers an incredible opportunity to brand yourself. Even more important for those of us who write books, it also makes us responsible for the quality of work we produce online. As experts, we have a much greater chance to stand out – because we are accustomed to creating great content.