The "Here in Canada we have bigger issues..." comment is not true.While we do have some network failover routes that run through the US, most traffic can be and is routed exclusively inside Canada. Almost all government and public sector organizations have laws & policies in place prohibiting network traffic from passing through the United States since the Patriot Act was implemented. Frankly, that act has been great for our network and Data Centre industries.
Which is not to say that CSIS are not snooping just like the NSA.

I am trying to understand how you are blocking access to a web site?
Do your users all go thru a http proxy? What if they don't? I have three internet access points, none use a web proxy (That I know of :-)
Do you block DNS? I can point my dns anywhere I want.
Do you block an IP address?
Falling back to the Internet sees censorship as a malfunction and routes around it. How do you stop people from routing around you? (WIthout begin China and having controll of all the network links in and out of the country)
Just trying to understand this. thanks.

Plus Canada has lots of green hydro electricity. And data stored in Canada is exempt from the US Patriot act.