Snapchat: Designing for Disappearing

In 2011, every photo app on earth was built to save and share forever. Instagram and Facebook had turned permanence into a business, betting that people wanted to archive their lives. Then a Stanford student named Evan Spiegel pitched the opposite: messages that vanish. The reaction was skepticism, even ridicule. Why would anyone want a photo that disappears? But Spiegel had been watching how younger users actually behaved, and what he saw didn't match the industry's assumptions about what people wanted.

For founders and operators, this is a case about the gap between what an industry believes and what your specific users actually do, every day, with their thumbs. It sharpens the decision of whether to follow the category consensus or build for a behavior you can observe but can't yet prove with data. Read the story before you assume you already know which one wins.