“Starting April 21, we will be expanding our use of mobile-friendliness as a ranking signal.” With those words, Google began communicating a potentially large-scale change to the digital marketing landscape. Google’s changes to the algorithm, dubbed “Mobilegeddon,” could negatively impact sites with arcane web development practices. Companies like Nintendo, Kroger, and Versace have all failed the mobile-friendly standard that Google has championed. For a....