Twitter was the world’s fastest-growing social platform last year, with the micro-blogging network’s 40 percent active user growth between Q2 and Q4 of 2012 more than enough to push Facebook and Google+ into second and third place respectively.

Twitter grew significantly in many countries, with active user gains of more than 50 percent in Hong Kong, Russia and China, but, after a couple of years of stagnation, it’s Twitter’s huge advance in the U.S. that is perhaps its most incredible feat to date.

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