So, we compiled this gallery of the single letters of Twitter. Unsurprisingly, nearly all the accounts are used heavily. The average single-letter Twitterer has Tweeted 3,266 times, follows 302 people, and is followed by 2,896. That might seem like a lot relative to the average user, but none are celebrities or power users like a Tim O'Reilly and his 1.4 million followers. @T aka Tantek Çelik, a developer, has the largest number of followers in the group with his 13,005. @L, a protected account with a bio of "Do Not Disturb," has 0.
Yeah, I wonder what it's used for.