Our algorithm looks at a combination of factors and signals that may impact on the Penguin update and can be SPAM indicators. We use next factors:
- Domain Trust and Citation
- Domain Topic Flow
- Domain Trust vs Domain Citation
- Page Trust Flow
- Page Citation
- Outbound backlinks
- Anchor vs Total Text Ratio
- Social signals
- Link attributes
- Website Page Authority and trust
- External backlinks count to domain/page
- Malware test
- Count of external links in sidebar/footer
- text vs html ratio
- Content count on page
- If page/document is indexed.
- Direct referral traffic from the site.