In recent mid of October Google launched another algorithm as part of series its updates like Panda and Penguin called Google EMD algorithm updates for giving net surfers more refined results and relevant quality results. This update hits low quality/spammy and exact match keywords domains. Like Google Panda, Google Penguin it will run periodically refined more quality websites for the surfers. Google wants more accurate and natural results for his searchers that why disallowing spammy and low quality web sites to get rank higher. If you don't want to be a victim of one of Google's updates, avoid all spammy and short cut tactics for higher ranking and remove all keyword stuffing contents even those that are written for search engines or from marketing prospective. Be natural and write in a natural way for your audience.