On the origins of Twitter:
He was fascinated by the haiku of taxicab communication—the way drivers and dispatchers succinctly convey locations by radio. Dorsey suggested that his company create a service that would allow anyone to write a line or two about himself, using a cell phone’s keypad, and then send that message to anyone who wanted to receive it. The short text alert, for him, was a way to add a missing human element to the digital picture of a pulsing, populated city.
The man has already moved on to Square, which if you’re not familiar with, is a mobile payments system, allowing shoppers to pay with financial details stored on their smartphones via NFC.