The easiest way to tell you have product-market-fit is unsolicited acts of affection from users. People reach out of the blue, in private and in publ… - Guillermo Rauch

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The easiest way to tell you have product-market-fit is unsolicited acts of affection from users. People reach out of the blue, in private and in public, to tell you how much they love the thing you created. This is incidentally the most rewarding part of it all.