Project Cohort enables individuals, organizations, and local business owners to promote their passions beyond their existing network. In a few seconds, they can easily communicate through advertising infrastructure at a micro-scale and low-cost to targeted custom audiences, such as a neighborhood, school, workplace, or hometown. These sponsored messages appear across the web, apps, and social media as a welcome reprieve from traditional ads, yielding strong responses that can be analyzed, compared, and optimized. By democratizing sponsored messaging, Project Cohort empowers regular people to increase their influence and impact far beyond traditional social tools.