A username is used to identify you on Twitter. A username is unique to only one person, so it allows people to find other users without having to sift through hundreds or thousands of people who have the same name.
a username is what you will be called on twitter.
@username
You can send a tweet to someone by beginning your tweet with their username (@username)
Start your tweet with @username (replacing 'username' with their actual username) then type your message and then send.
Labrinth's Twitter username is @labrinthda1st
You write your message in the same place that you send normal tweets (the big white box at the top of the page). Start your tweet with the persons username (@username)
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'.
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.
Her username is @katiewaissel24
You choose your username when you sign up.