Since it first opened its doors to the general public back in July 2006, Twitter has expanded rapidly around the world, quickly establishing itself as the de facto micro-blogging network in almost every major country.

In August we looked at a study that suggested, perhaps unsurprisingly, that the bulk of Twitter’s 500 million (and growing) registered membership was located in the USA, with some 141.8 million users.

But what about active users? Which country heads that table?

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