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If you registered for Twitter in the past two or three years, chances are you didn't get your top choice handle. That's probably because Twitter use has grown exponentially, topping 200 million accounts this year. But get ready to meet the users that scored premium real estate with the shortest Twitter usernames on Earth.
When Twitter launched in July 2006, it would only issue usernames of four or more characters. But user @r (Rex Hammock) says he simply petitioned Twitter employees for something more succinct. "At the time," he remembers, "Twitter probably had three employees, so it wasn't a bureaucracy that met about stuff like who deserves a one-letter username."