Zuckerberg’s “family of apps” plan. Cox told Zuckerberg he needed to let the products build independently and not become too similar. “They’ll compete a bit with each other, but if we have more unique brands, we’ll be able to reach different kinds of users.” He and Systrom had spoken extensively about using Harvard professor Clayton Christensen’s “jobs to be done” theory of product development, which states that consumers “hire” a product to do a certain task, and that its builders should be thinking about that clear purpose when they build. Facebook was for text, news, and links, for example,
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