“The Happiest Story about a Kid Dying of Cancer I’ve Ever Seen.” Upworthy watched the “feedback” pour in, monitoring both the percentage of people who clicked each headline and the number who shared it with their friends. It was a perfect, dispassionate science experiment, where the feedback could show Upworthy editors exactly which packaging would have the biggest impact—before they released it to the rest of the world. In moments, the results became clear: people clicked on the third headline 20 percent more often than the original. But that wasn’t the end of the test. Upworthy wrote
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