By processing hosts file, you tell your system to use a specific IP address instead of the normal one (the one given by the DNS server) when you type a URL into the browser's address bar.
So when someone wants to visit the σελίδα facebook.com its IP (at the time of writing) is 126.96.36.199, you can make your browser send the interested to the local address 127.0.0.1 which shows nothing.
Edit the hosts file
First, you need to find the file. Follow the route:
When you get to the etc folder, open the hosts file using any word processor you want. We recommend (once again) notepad ++, which is free and very reliable.
You will need to open the file with administrator privileges before you can save the changes.
So choose which application you want to edit the text with, right-click on the icon and "run as administrator."
When you open the hosts file, you will probably see something like this:
You can add the entries you want below the last row without adding the "#" character at the beginning. The pension should be as you see below:
Each domain you want to block must appear just below what you first wrote. You can add both www and non-www versions of the site in separate lines. That's it.
Do not attempt to provide a specific URL such as facebook.com/messages/etc. You use hosts to block domains, not pages.
Once you are done with the list of domains you want to block, save the hosts file.
In some cases, you will find that your block works immediately if you try to open the page on browser and other times you will need to restart your computer.
If you find that the page you want to block still works, try adding it real IP address of the site along with the local IP.
The real IP of a page can be found easily. In search of Windows type cmd and open the application from the results.
Enter the ping and domain you want to find the IP.
So in the case of Facebook, the hosts file should also contain the following order.
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