For sharpening the pinning process.
Tim Kendall had a dilemma: How could Pinterest be more useful on mobile? The answer came in a thousand details unveiled last summer, when Kendall launched iPhone, Android, and tablet apps that let recipe pins include ingredients, for example, and travel pins include photos and maps. The result: Some 75% of traffic now comes from mobile platforms. "It was the summer of apps," he says, "and we worked at breakneck speed."