February 10th, 2012
#FridayFunFact4: Pinterest just hit 11.7 million unique monthly visitors, crossing the 10 million mark faster than any other standalone site in history.
From this article and scoop by TechCrunch.  Pretty cool stat (albeit a few days old but we wanted to save it for our Friday Fun Fact).
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pinterest growth
pinterest usage
social media networks
friday fun fact