while working on dispatching as a programmer, dorsey moved to california. in 2000, dorsey started his company in oakland to dispatch couriers, taxis, and emergency services from the web. his other projects and ideas at this time included networks of medical devices and a "frictionless service market". in july 2000, building on dispatching and inspired in part by livejournal and by aol instant messenger, he had the idea for a web-based realtime status/short message communication service.