how to block a site on your computer

hi guys . today im gonna show u how to . block a website on your own computer.  ECCO A VOI UN VIDEO GUIDA

1. GO TO C:/WINDOWS/SYSTEM32/DRIVERS/ETC/
2. OPEN HOSTS WITH A NOTEPAD
3. WRITE 127.0.0.1   www.facebook.com  
4. SAVE IT
5. CLOSE UR BROWSER N RE-OPN IT ;) 

TO RESET  YOU HAVE TO DELETE 

127.0.0.1 www.xxx.com  <------- this part