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how to save username on facebook
There is Facebook page with the Longest Username than any other:ThisIsTheLongestUsernameOnThisSocialNetworkForSure
A Facebook Username is for your "special" page URL. Say if you used "Waffles" as your username (if it was available) your Facebook URL would be "www.facebook.com/Waffles", also, you can use your username in place of your email when you sign in.
No
While browsing your Fb profile you can see the address bar, after the slash will be your username or else you can go to settings and just set your username according to your choice.
your email address.
willowsmith123
It is the name that Facebook members choose to be known as on the site.
You can change username by following below steps given on website below. http://www.adkool.com/2009/06/grab-your-facebook-username-before.html
you have to get a email and that is you user name so after you get a email just go to facebook.and sign up.
You can use the same username and password for Facebook for other sites but it is not recommended. If someone were to discover your username and password for one account, they would then have access to all the accounts where you used that same username and password.
Facebook account have unique facebook user profile and its link is created along with uniquie user id, this is facebook profile link. If user has spesified a username then the facebook profile link contains username instead of id.