It has been terribly disingenuous policy to delete customer reviews authored in English on Amazon.co.jp. Now, along with importing English reviews from Amazon.com to Amazon.co.jp it would be wise to direct English reviews authored on Amazon.co.jp to Amazon.com for aggregation so that customers might have their voluntarily contributed data respected by the service they choose to use. The same of course goes for Amazon.com shoppers who wish to shop Amazon.com in Japanese and could benefit from the wealth of reviews on Amazon.co.jp.
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