Threader is an iOS Twitter client that allows users to read long-form tweets in a more readable format, called "threads," and bookmark them. The company was founded by Vincent Denise and his partner Marie in 2017, with the goal of providing an alternative reading experience for Twitter users. They built their app using MongoDB, which they chose for its scalability, high performance, and flexibility. The company has bootstrapped itself and relies on paid users to earn income. MongoDB's Technical Support program helped them overcome unexpected growth issues and provided valuable advice and connections within the community.