Google - How does google detect duplicate content, Algorithm to detect duplicate content
How does google detect duplicate content
According to the patent description, Google's web crawler consults the duplicate content server to check if a found page is a copy of another document. The algorithm then determines which version is the most important version.
Google can use different methods to detect duplicate content. For example, Google might take "content fingerprints" and compare them when a new web page is found.
Interestingly, it's not always the page with the highest PageRank that is chosen as the most important URL for the content.
"In some embodiments, a canonical page of an equivalence class is not necessarily the document that has the highest score (e.g., the highest page rank or other query-independent metric)."
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