Look at the below picture. The first one is a URL before getting vanity URL and you never like to share this with others because it is too difficult to remember.
The second one is the URL after achieving your vanity URL in Facebook and surely you and everyone like to share it with ohters.
So never be late to get your username otherwise another person may get your desired username and you then have to add additional character that definitely you don't want.
To get your vanity url just Click Here
