Block website without using software

I am going to explain a simple method that anyone can do to block particular websites on their computers.
Follow this tutorial:
Browse to -> C:\WINDOWS\system32\drivers\etc
Find the file named "HOSTS" and open it in notepad.
Under "127.0.0.1 localhost" Add 127.0.0.2 www.clicker.com , and that site will no longer be accessible on your computer.To block another website, simple add "127.0.0.3 www.flickr.com" and so on.

Here is an example of my "HOSTS" file--

Code:
127.0.0.1       localhost
127.0.0.2       www.orkut.com
127.0.0.3       www.facebook.com
::1             localhost