As a teenager, Dorsey created taxi-dispatching software that was adopted by taxicab companies. He attended New York University before moving (1999) to San Francisco, where he set up a company that used the Internet to handle the dispatching of couriers and emergency vehicles as well as taxis. In 2000 he first considered using text and instant messaging (based on the principles of dispatch software) as a way of keeping in touch with ... (100 of 290 words)