Facebook used to require pages and individual users to have at least 25 friends in order to claim a customized address extension. That meant any newbie had to accept an ugly URL usually including a long number. NOTE: This has changed back since this post was published. You do still need 25 fans in most cases.
No one can remember URLs like this and they’re too long to put on your marketing materials.
Now you no longer need 25 friends for your profile or page to get an easier-to-remember address.
Go to facebook.com/username to choose custom URLs for your pages.