Search Engine Ranking factors; SEO 2009

Overall Ranking Algorithm

Google Search Ranking

24% Trust/Authority of the Host Domain
22% Link Popularity of the Specific Page
20% Anchor Text of External Links
15% On-Page Keyword Usage
7% Traffic and Click-Through Data
6% Social Graph Metrics
5% Registration and Hosting Data



Top 5 Ranking Factors

1.- Keyword Focused Anchor Text from External Links
      73% very high importance
2.- External Link Popularity (quantity/quality of external links)
      71% very high importance
3.- Diversity of Link Sources (links from many unique root domains)
      67% very high importance
4.- Keyword Use Anywhere in the Title Tag
      66% very high importance
5.-Trustworthiness of the Domain Based on Link Distance from Trusted Domains (e.g. TrustRank, Domain mozTrust, etc.)
      66% very high importance

Top 5 Negative Ranking Factors

1.- Cloaking with Malicious/Manipulative Intent
      68% very high importance
2.- Link Acquisition from Known Link Brokers/Sellers
      56% high importance
3.-Links from the Page to Web Spam Sites/Pages
      51% moderate importance
4.- Cloaking by User Agent
      51% moderate importance
5.- Frequent Server Downtime & Site Inaccessibility
      51% moderate importance

See all ranking factors

Fuente: SEOMOZ

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