"Look at people's eyes. That's the metric. When you're showing people early prototypes to see if we have PMF, what I'm always doing is looking at people's eyes. It is not about DAU, or DAU/MAU. It's none of that. It's literally like, hey, Lenny, did you see this? What do you think about this? If your eyes light up, if you lean in, these are the signals you're looking for." Full conversation: https://youtu.be/3I6QYkccd3o?si=rKQEGgnz…