Look for friction that reveals hidden demand

I looked on the App Store and the number one app in the United States was an app called Sarahah, but the entire app was in Arabic, like the strongest signal that you could ever have that people want something.

Where people are trying to obtain a particular value and going through a very distortive process. If you can actually crystallize what their motivation is, you can have this kind of intense adoption.

Our general framework for prioritization is to look for user demand, and actually the easiest way to check for user demand is to just see what has virality.

You can measure how well the product might be received even before you built anything.