Google is expected to roll out a major change to its search ranking algorithm on April 21, 2015. The update, dubbed "Mobilegeddon" by some, will focus on improving the quality of Google's index by raising the rankings for mobile-friendly websites (hence the name). Google has taken a keen interest in mobile compatibility lately, encouraging websites to update their websites and blogs so they are compatible for smartphone users. To better prepare webmasters for the upcoming Mobilegeddon, Google has published a guide on common mobile mistakes. The Mountain View company first tweeted the guide ...