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How to block facebook.
As you can see facebook works now.
Go to C:\Windows\System32\drivers\etc.
Make a copy of host file.
Now click Properties
Go to Security -> Advanced -> Change Permissions
Select Users and click Edit
Check Allow in Full control and click OK
Click OK, YES, OK, OK
Now open hosts file in Notepad
Write three lines there
127.0.0.1 facebook.com
127.0.0.1 www.facebook.com
and
127.0.0.1 login.facebook.com
Close the file with saving changes.
Now You need to restart your computer.
After restarting the computer facebook does not work.
On all browsers on the system.
After installing another browser facebook will not work in it.
If you want that facebook works you need to edit hosts file and remove the appended lines.