Theres a file located in C:\Windows\System32\drivers\etc called hosts that allows you to block domains. This isn't permanent, if the user you're trying to block knows this method then they can easily edit it themselves and regrant access themselves, just with past experiences most people don't know this method.
127.0.0.1 facebook.com
127.0.0.1 www.facebook.com
127.0.0.1 m.facebook.com
127.0.0.1 touch.facebook.com
127.0.0.1 blog.facebook.com
127.0.0.1 apps.facebook.com
127.0.0.1 facebook.ca
127.0.0.1 developers.facebook.com
I've hunted for a bit to find other domains that make Facebook accessible and these are the ones I've found so far, so this list may grow if myself or others find more in the future.
#127.0.0.1 facebook.com
#127.0.0.1 www.facebook.com
#127.0.0.1 m.facebook.com
#127.0.0.1 touch.facebook.com
#127.0.0.1 blog.facebook.com
#127.0.0.1 apps.facebook.com
#127.0.0.1 facebook.ca
#127.0.0.1 developers.facebook.com
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