There is no minimum number of characters that a Twitter username has to have. You can have a username with only one character, if you would like. There is a maximum number of characters that a username can have, though. A username cannot be longer than 15 characters.
Yeah it uses,that's why twitter has a limit of 15 characters in a username.
Labrinth's Twitter username is @labrinthda1st
No it doesn't include your username. However, any usernames that you mention in your tweet are included in the 140 character limit.
Jonothan Ross's username on Twitter is Wossy.
Cory Monteith's Twitter username was @CoryMonteith
Dani Harmer's Twitter username is @MissDaniJHarmer.
Actress Alyssa Milano's username on Twitter is: @Alyssa_Milano.
To do a retweet on Twitter by someone famous you can either use Twitter's in-built retweet function or type 'RT@username' where username is the famous person's username on Twitter and press 'tweet'.
Her username is @katiewaissel24
You choose your username when you sign up.
Her Twitter username is @kekepalmer
His Twitter is @drewseeley