How to change the localhost name in ubuntu (Linux)?

Requirements:
apache server should be installed.

    Open the Terminal
    type this command and press enter

    sudo gedit /etc/hosts

hosts will be opened in notepad.
you can find this line :

    127.0.0.1    localhost.localdomain    localhost


Just change the localhost to www.facebook.com
Restart the apache server.
Don't you know how to restart the server. nothing to worry just enter the following command in terminal:

    sudo /etc/init.d/apache2 restart



and thats it!!
Now if you put www.facebook.com in your browser then you will get the default localhost index.html on your browser....