We did shorten Twitter to 'twttr' for a moment: CEO
Responding to a question from a user about the word 'Twtr', Twitter CEO Jack Dorsey on Saturday said, "We did shorten Twitter to twttr for a moment to refer to the texting short code we wanted to use: 89887." He further said that the code was already taken so they "stuck with 40404 and added the vowels back in".