2009 love Shanghai search engine update frequently go hand in hand with human intervention, the query processing technology (keyword segmentation technology) update, strengthen and enhance the user experience, product page weight: Wikipedia, the arts, and know Post Bar etc..
1. stations for punishment, reduce the weight of spam links.
2011 love Shanghai update strength rose sharply, and the self adjustment algorithm.
update and punishment
2009-2010 update and punishment:
7. Links drop right over the site and porn site in the chain.