Anytime words, speech or information is banned or blocked from the general public. Blocked because they do not agree with your information. This is the complete opposite of freedom of speech. This does not include racist or slanderous remarks but patently legitamate and common knowledge that they are trying to debunk or discredit.
I wrote a great definition for patently, but since wikipedia, urbandictionary, and craigslist are patently run by disinformation fenatic's they dis-agreed with my definition and hence created a blocking of speech scenario.