By now Facebook has offered the profile URLs that have string of numbers in it (like facebook.com/profile.php?id=588454734&ref=name) thereby making it unsuitable for you to share it with your friends and family. But now facebook has decided to offer desired profile URLs on the first come first serve basis i.e instead of that confusing string of numbers in your profile URL you can now have your name or any other your desired username in your profile URL to personalise it. The personalised URLs (Vanity URLs) will be easy to remember and share, just like this http://www.facebook.com/yourusername.
Now depending on your timezone you can pick your desired facebook username from facebook.com/username/ either on friday or on saturday. For getting the exact timing of username allotment in your time zone just login to your facebook account and click on the tab “Home” to go to your facebook homepage and there you will see a facebook announcement like shown below.
Note: Your username must be at least five characters in length and only include alphanumeric characters (A-Z, 0-9), or a period or full stop (“.”). Username Once Selected can’t be changed, so be careful.