• Keyword Focused Anchor Text from External Links73% very high importance
   
• External Link Popularity (quantity/quality of external links)71% very high importance
   
• Diversity of Link Sources (links from many unique root domains)67% very high importance
   
• Keyword Use Anywhere in the Title Tag66% very high importance
   
• Trustworthiness of the Domain Based on Link Distance from Trusted Domains (e.g. TrustRank, Domain mozTrust, etc.)66% very high importance
   

• Cloaking with Malicious/Manipulative Intent68% very high importance
  
   
• Link Acquisition from Known Link Brokers/Sellers56% high importance
  
   
• Links from the Page to Web Spam Sites/Pages51% moderate importance
  
   
• Cloaking by User Agent51% moderate importance
  
   
• Frequent Server Downtime & Site Inaccessibility
   

51% moderate importance

• Cloaking by Cookie Detection      16.3% strong contention
• Cloaking by JavaScript/Rich Media Support Detection      15.4% moderate contention
• Hiding Text with same/similar colored text/background     15.3% moderate contention
• Cloaking by IP Address      15.3% moderate contention
• Cloaking by User Agent      15.2% moderate contention

• 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