Facebook usually launched something to a tiny percentage of its user base, around 1 or 2 percent, to see how people reacted. Then it could roll the new product out to 5 percent, or a couple countries, before eventually reaching the rest of the world. Zuckerberg thought it was important to gather data on how a product would affect the company’s underlying usage metrics. Facebook also tended to release products half-baked, and use the feedback to tweak them in real time. The Instagram team was going to try the opposite: launching Stories, at least a simple version of it, to all 500 million of
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