Pinterest pierces the ranks of the social-networking elite

The site, which allows users to pin images of products they like on online scrapbooks, has seen its traffic grow almost sevenfold in five months and is ranked by one research firm as the No. 3 social network behind Facebook and Twitter.

To orchestrate her wedding next month, Dara Weiner's biggest helper isn't her party planner or her devoted fiance — it's the Pinterest website that now dominates the time she spends online.

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