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€™t really like. if you are in the later league and you repent your choice you have a chance now to pick up a good username for yourself.
Facebook when it launched the vanity URLs said that you canâ€™t change the username once you pick one, but now they quietly enabled a one time change for the same. That means you have one more chance to grab a good username which reflects you or your brand.
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]