Glossier

Emily Weiss started a beauty blog in 2010 while working as a fashion assistant, interviewing women about what they actually put on their faces. Four years of comments later, she launched a skincare brand built to the specs her readers had been asking for, and grew it past a billion-dollar valuation with almost no traditional advertising. The audience she had quietly assembled was never just an audience.

This is the case for any founder who suspects their customers could be more than buyers. It sharpens the decision of how to sequence audience, product, and distribution, and what you give up by treating customers as targets instead of collaborators. The mechanism that turned readers into a sales channel is the part worth opening the app for, because it is easy to admire and hard to copy.