Did you know that it took Facebook designers over 280 hours to redesign the new “like” button? Director of Product Design Margaret Gould Stewart talks about why a seemingly tiny detail—like a button—can make a big difference in the usability of a product.

In this TEDtalks video podcast, Margaret Gould Stewart outlines three rules for design at such a massive scale—one so big that the tiniest of tweaks can cause global outrage, but also so large that the subtlest of improvements can positively impact the lives of many.

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