The Precise Test for Determining Consumer Product-Market Fit

When your 15 year old's classmate, or your 83 year old Mom's friend, randomly falls in love with your app or service.And so congrats to Resolute-backed Happier: My 15 yr old daughter emailed me today. Which, in and of itself, is a minor miracle. One of her classes was discussing iPhone apps and asked kids what their favorite apps were. And one of the classmates described Happier as her favorite app. Boom!PS: no word yet from Grandma...