Thanks to the Clients from Hell, the Rules for My Unborn Son, and the Sad Don Drapers, the blogging platform Tumblr is about to hit a major milestone: 10 billion blog posts. Yet as its user base swells, Tumblr itself has miraculously managed to stay relatively petite: Only 45 people are on staff, including a surprisingly tiny product team consisting of five people. And for such a design-savvy, image-driven platform, here's the most surprising fact of all: Tumblr's design department consists of only one designer, Tumblr design director Peter Vidani.
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