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Over the last 10+ years I've geo filtered all of my ad buys to only high quality countries US/CA/UK/AU etc... but majority US traffic. One of my mainstream sites only works on US/CA traffic as it doesn't sell a physical product but entertainment events and 90% of them take place in those 2 countries. Depends on the product/service I'm promoting where I'll buy from. If I can make it work I'll buy from anywhere. Up until this point however all of my sites see an overwhelming percentage of their traffic from the US.
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