The CBC sensors comments all the time for purely political reasons. It's disgusting. You never know when your conversations there will be arbitrarily stopped. Other users can see no indication of the censorship. On the other hand, if your views agree with the reporters you're free to break all of the official posting rules including using profanity and directing personal insults at other users.
CBC also shuts down comments entirely to stop criticism and often disables comnents on articles likely to draw criticism.
If you want to feel a taste of how the Chinese internet is go spend some time on the CBC web site.
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