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Beauty store marketers looking to get the most from social media can no longer ignore Pinterest—a social network devoted to the posting of photo and image collections—which has quietly become the third-largest social network in the world. According to figures released by Experian Hitwise in April, Pinterest brought in 104 million visits in March, lagging only behind Twitter, which drew 182 million visits, and goliath Facebook, which attracted 7 billion visits.