Most networking sites offer this feature, where in you can show your real number when connecting with friends and family. Up until now Facebook did not have this feature. If you had to share your facebook profile with your friends, the URL would have a randomly assigned number like “id=933152075”.
This has changed now, as Facebook now lets you use your Username in the URL. Go to http://www.facebook.com/username/ to get your own personal user name.
This becomes your personal destination and helps you in branding. If you are wondering how, then head to http://twitter.com and analyse it yourself.