Google Site and Link Analysis refers to the analysis of information about websites, pages, links and patterns. Patented in 2005, Google looks at factors such as the following:
- The length of domain registration
- Domain ownership changes
- WHOIS data and physical address information
- C-Class IP information
- Keyword and non-keyword domains
- The discovery date of new domains/pages
- Document change frequency and the amount of change
- The number of linked internal documents
- Link anchor text
- Link discovery date
- Link changes and deletions
- External link growth patterns
- The authority of external links
- Link quality ratios
- The distribution of links
- The lifespan of links
- Link patterns (new vs old and old vs new)
- Anchor text variety
This is not a complete list. You can get a detailed analysis of this document by GrayWolf at Thread Watch.
It's not clear whether this has been incorporated into Google over the years, but it's a good idea to keep this information in mind when you do link building.
Link spikes can be measured against the search volume in a specific topic. If link spikes are not supported by search volume trends, Google can discount or penalize websites. If the linking pattern exceeds the natural or usual pattern, Google will pay more attention to your website, triggering specialized algorithms to determine whether links are spammy or natural. Remember, Google also owns Google News and can correlate events to link patterns.
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