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As you can see here, this is an issue as Google are indexing many variations of the same page although this means that somewhere is linking to them unless your site is set up so that even a crawler passing through links to your contact page is creating the query parameter in the URL's. To resolve this, you need to add the following to your robots.txt file:- Disallow: ?referurl= This will prevent any URL's passing that query parameter from getting crawled and indexed ensuring that only the originals of the pages will appear in search engines and not flag as duplicate content. Hopefully, someone from SEOmoz can add as to whether there is an option for obeying robots.txt directives within their crawler so that these URL's are not listed as I'm not sure.