If you didn’t already know, starting at 12:01 a.m. EDT on Saturday, June 13, you’ll be able to choose a username on a first-come, first-serve basisfor your profile and the Facebook Pages that you’re administrator of. You will be able to do this by visiting www.facebook.com/username/.
You can only choose a single username for your profile and for each of the Pages that you administer and you better think twice before choosing your username. Once it’s been selected, you won’t be able to change or transfer it – ever!
Visit the official Facebook vanity URL FAQs page for answers to common questions, and if you’re an administrator of Facebook Pages, get more info here.
Get your URL before sombody else does! Otherwise you might end up like the next Kanye West; bitter that someone got that username before you could.