1 After less than two years in business, Pinterest is already one of the most popular social networks in the world, as measured by engagement, accordi..
2 As you can see here, it's ranked just below Facebook and Tumblr as the most popular site to hang out on.
3 One other thing of note on this chart is Twitter's low engagement rate.

http://static7.businessinsider.com/image/4f35911869bedd1d1e00003b/chart-of-the-day-pinterest.jpg
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