National and international news outlets have been cooing over the app, branded an Instagram for doctors, and reporters have delighted in thumbing through its endless parade of often ghastly medical curiosities. Figure 1, which was invented by a then-Stanford Medical School investigator and launched in 2013, lets doctors puzzling over a tricky diagnosis effectively crowd source the task by uploading an image of, say, an unusual rash, and asking: Hey, anybody seen anything like this before. It's mobile and visual and simple, and it's got an element of fun to it.

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