|When Google detects duplicate content, such as variations caused by URL parameters, we group the duplicate URLs into one cluster and 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. Consolidating properties from duplicates into one representative URL often provides users with more accurate search results. |
To improve this process, we recommend using the parameter handling tool to give Google information about how to handle URLs containing specific parameters. We'll do our best to take this information into account; however, there may be cases when the provided suggestions may do more harm than good for a site.