One of the popular social networking sites Facebook launched the usernames today for the users to represent their identity.
Just like the usernames in Twitter and other sites, you can also choose your username before someone else does it. The username will replace your Profile ID number with your selected name which will feel more personal to you.
Just login and visit http://www.facebook.com/username/ to select one for you. However you can only use letters (A-Z), numbers (0-9) and full stop (no underscore allowed). Once done, it will be your permanent facebook address then.