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I wonder why nobody remembers that Google+ has one great features that makes everything about targeting really simple: Circles. You can have just one business page for your site and that segment your different users in country/language specific circles so to update in different languages notifying the update circle by circle. Doing so, the Circles targeting others languages/countries won't see it. Splitting Google Plus presence is not the best because you are dispersing the power the business page may have. The only exception, IMHO, is when the business as a strong local presence in another market, hence it can be better to give to it a strong Google Plus identity too.