503 Most of you probably know what a 404 code is. SEO pros use 301 redirects as well. What is a 503 though? It’s a code telling the Google bot that a site is temporarily unavailable and not broken for good.​ You need it when performing site maintenance resulting in downtime.​ See: http://googlewebmastercentral.blogspot.com/2011/01/how-to-deal-with-planned-site-downtime.html A/B Testing The process of comparing two (or more) versions of a page to find out the best performing one, i.e. the one that is yielding the highest conversion rate.​ See: http://www.seoptimise.com/blog/2010/07/30-multivariate-ab-split-testing-tools-tutorials-resources.html Advanced segment​s Advanced segments allow you to show only particular parts of your site’s traffic in a Google Analytics report. You can customize and save them to return to the same report again. If you are serious about SEO, you use them all the time.​ A common advanced segment is social media traffic, for instance.​ See: http://analytics.blogspot.com/2009/02/urban-apparel-and-advanced-segments.html http://www.kaushik.net/avinash/2008/10/google-analytics-releases-advanced-segmentation.html Citation Citation is the equivalent of a link for local SEO, but of course it’s not really the same as a link. It’s more a mention and a link on a site that is relevant for the Google Places algorithm. In a…