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This is a new question for me! I actually hadn't considered Google+ pages for international expansion. I'd determine the best way to go about this by asking yourself if what you would post on separate Google+ pages would be different? Does the market require different material? Are they interested in different things? Are there different products and services for that market? Do you have a separate subsite (either ccTLD or a subfolder/subdomain of your main TLD) for that market? Is it different? If the answer to those questions is yes, then yes. If not, then stick with one.