How to block facebook from your google chrome?

You can see the file named hosts in blow path.
C:\Windows\System32\Drivers\etc
You have to edit in follow method.

Open the notepad program right click run as administrator.
click the file then click open hosts file from following location.
C:\Windows\System32\Drivers\etc.

You can see the IP address in last line
127.0.0.1

You can add the web address or URLs after IP address what you have to block.
if I want to block FACE BOOK
I should type 127.0.0.1 facebook.com.