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Lets assume for a moment that SEO didn't exist and you had 1,000 links to sites in your search engine for a particular result. Wouldn't the best measure of a page's relevance to a search term be how long the average visitor stays on the page before clicking the back button? Of course it gets messed up when people go forward instead of backward after clicking a link.
But if someone could develop an algo that took into account this "human" ranking of search results... we would all get better results in the end.
Of course once word got out to me and others that do SEO, we would spend all remove the back button from our browser and spend all day clicking our own links.