Hi Mozzers, We have a marketplace with 20k+ products, most of which are written in English. At the same time we support several different languages. This changes the chrome of the site (nav, footer, help text, buttons, everything we control) but leaves all the products in their original language. This resulted in all kinds of duplicate content (pages, titles, descriptions) being detected by SEOMoz and GWT. After doing some research we implemented the on page  rel="alternate" hreflang="x", seeing as our situation almost perfectly matched the first use case listed by Google on this page http://support.google.com/webmasters/bin/answer.py?hl=en&answer=189077. This ended up not helping at all. Google still reports duplicate titles and descriptions for thousands of products, months after setting this up. We are thinking about changing to the sitemap implementation rel="alternate" hreflang="X", but are not sure if this will work either. Other options we have considered include noindex or blocks with robots.txt when the product language is not the same as the site language. That way the feature is still open to users while removing the duplicate pages for Google. So I'm asking for input on best practice for getting Google to correctly recognize one product, with 6 different language views of that same product. Can anyone help? Examples: (Site in English, Product in English) http://website.com/products/product-72 (Site in Spanish, Product in English) http://website.com/es/products/product-72 (Site in German, Product in English) http://website.com/de/products/product-72 etc...