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Also, just to complete this, you can now use the rel=hreflang tag to tell Google when you have duplicate content that is directed at different countries.  If the content is truly duplicate, you can use the rel=canonical (but be careful about using both at the same time).  Check this post for mor details: http://searchenginewatch.com/article/2232347/A-Simple-Guide-to-Using-relalternate-hreflangx