Google was one of the first major search engines to use a sophisticated algorithm to determine the relevancy of web pages in search results. Their 'PageRank' algorithm - together with a ton of other signals - became synonymous with Google and rendered many of the incumbents useless almost overnight. Goodbye Excite and Lycos. Most social media marketers will be aware of the mysterious and ever-changing 'EdgeRank' algorithm employed by Facebook. EdgeRank - which is not too dissim...