Vanity URL is a customizable link which is short and easy to remember & share with others.
Default Facebook profile url is something like
It’s complicated neither can be remembered nor can be told to anyone.
After modifying the url it will be like
Its short, simple and easy to share.
Visit the link below and set vanity url for your Facebook profile and same can be done for Facebook Fan Page which will turn out to be very useful in its promotion and also in SEO.
Note : Do take good care while selecting vanity url because you won’t be able to change or transfer it later.