How Instagram became an engine of e-commerce

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It is a classic tension in business: pleasing users versus making money. You’d think it would be simple. But countless enterprises compromise depending on who’s writing the check. If users aren’t always the ones paying bill, as is the case in ad-based media businesses, the commercial urge easily can lead greedy and short-term-oriented managers astray.

In her illuminating feature in the new issue of Fortune, “Confessions of an Instagram Addict,” Kristen Bellstrom explains how