Google Penguin could be headache to black-hate SEO

Google Pengun is a code name for the Google algorithm update that was first announced on April 24, 2012. The update aimed at decreasing search engine rankings of websites that violate Google’s Webmaster Guidelines by using black-hate SEO techniques such as keyword stuffing, cloaking, participating in link schemes, deliberate creation of duplicate content, and others.






More study: http://searchengineland.com/library/google/google-penguin-update