SEO Optimization/Positioning can be described as a multifarious technique and it can use up whole lot of budget/time. Hence, Companies should make certain that your SEM Marketing/Optimization Services Company has knowledge in rendering top-most Search engine rankings for your web site . Companies ought to surely ask for existing/previous client references. You'll be able to easily spot various SEO /SE Marketing specialists asserting to have SEO optimized websites for 100 corporate clients, but if you courteously ask them to provide reference of one single client they would appear to dawdle.