Web sites can have more than one domain URL so they all need to be found and blocked. To do this we can use “Web Usage”

• Select Enable Web Usage Monitor

• Clear History

With your web browser browse to web page that you would like to blocked then view the results in “Recently Visited Sites”

https://www.facebook.com/

From the search results we can see top level domains are

• fbcdn
• facebook
• fbsbx