This document summarizes the story of Doubtcloud, an app that allows users to create and share doubts. It describes how Doubtcloud was conceived during a 1 hour trip, then a team was formed to build out the minimum viable product (MVP) over 3 months using lean startup principles. The MVP launched in February 2013 and allowed users to create doubts, share them on social networks, and comment on others' doubts. Several subsequent releases added features like Facebook comments, profiles, following other users, and finding Facebook friends. Data showed value was in picking rather than creating doubts, leading the team to pivot their focus to different applications of Doubtcloud. They are now exploring partnerships with organizations and lines of business.