What started out as a joke, "Let's create a place for virtual bathroom graffiti!" quickly became a cult hit. With a limited pilot on Northwestern University's campus, Stalltalk received over 600 unique visitors with 3,000 new posts in the first month alone. And that was with only 35 bathroom stalls! Colton knew the team had to take it further, so he immediately began planning for product extension. How do bathroom QR codes make money?