Google Penguin Anti-Spam Algorithm. Testing and Analyzing.
9/4/2012 24th of April will be remembered by many webmasters who on that day noticed a dramatic traffic downfall by 30-70%. This was caused by the new anti-spam algorithm by Google which was mentioned by Matt Cutts in the official Google Blog for webmasters. Since then quite a bit of time has passed and statistical data, successful and unsuccessful cases, along with some answers...