When you create a Facebook Page it is most likely to have a lengthy and complicated URL, like the link below:
Instead of having a URL made up of a random string characters, it is possible to obtain a simple and meaningful URL, like this one https://www.facebook.com/commentcamarche.
A custom URL (also known as Vanity URL) can help to improve the visibility of your Facebook Page and promote your personal brand.
For a Facebook Page to be eligible to receive a custom URL it must have at least 25 fans.
You can apply for a Vanity URL at this address: https://www.facebook.com/login.php?next=https%3A%2F%2Fwww.facebook.com%2Fusername%2F
Remember to keep the URL short and meaningful. Use only letters, numbers and the dot character to create the URL as no special characters are allowed. Don't use a registered trademark name, unless you own it.