Blocking Websites

Is there any trick to it that I don’t see? I block say facebook.com from a group of computers. It works great when the go to http://www.facebook.com But if they follow a link to https://www.facebook.com it allows access to the website. I tried blocking https://www.facebook.com and they still have access to that site (after the client restart). How can I block the https://****** from people? I’m running Avast Enterprise 7.0.223

Use your hosts file to block https:// sites.