Google SEO Ranking Factors 2013
Big Site Will Survive in The 2013
Google changed a lot in the search engine. Back links not the most important factors for increase keywords ranking. Page authority became very important.
Resource from SEOMOZ
Link relevancy and domain authority still very important when creating back links.
Resource from SEOMOZ
How to Increase the Page Authority
1 Increase the single webpage quality
2 Real users share the links in Google plus are very important