Facebook recently enabled custom usernames for users that created a land rush for the same. Some might be wise to pickup a good username for their profiles, others might have picked up something that they donâ€
Facebook when it launched the vanity URLs said that you canâ€
Go to account settings in Facebook and select username, you will that this is allowed only once, change that if you want. You may or may not get another chance to change your Facebook username. [Via RWW]