Meetup is a platform that allows individuals to create their own meetup groups on various topics. It has grown organically through an agile development process and by doing customer development and testing early and often. Meetup's founders conducted over-the-shoulder testing sessions with real users to better understand how people used the site and identify pain points, confronting their own biases. These inexpensive testing sessions provided valuable insights and helped shape Meetup's features and growth. The lessons of giving teams direct access to customers, identifying problems quickly, and launching frequently can apply to customer interviews, community building, and other initiatives.