https://marco.org/2009/03/25/wed-explain-the-site-to-people-we-met-at
We’d explain the site to people we met at restaurants or bars and they’d love it. “Oh, my whole family would use that!” they’d say. “I would pay good money for that.” They didn’t. Pay attention to what people do, not what they say. There’s a big difference there.
— Chris Wanstrath (thanks, jnunemaker)