Don't create multiple pages, subdomains, or domains with substantially duplicate content.
Avoid... "cookie cutter" approaches such as affiliate programs with little or no original content.
If your site participates in an affiliate program, make sure that your site adds value. Provide unique and relevant content that gives users a reason to visit your site first.
Duplicate content on a site is not grounds for action on that site unless it appears that the intent of the duplicate content is to be deceptive and manipulate search engine results. If your site suffers from duplicate content issues, and you don't follow the advice listed above, we do a good job of choosing a version of the content to show in our search results.
When we detect duplicate content, such as through variations caused by URL parameters, we group the duplicate URLs into one cluster.
We select what we think is the "best" URL to represent the cluster in search results.
We then consolidate properties of the URLs in the cluster, such as link popularity, to the representative URL.
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