Talk Radio 702 Eyewitness News (EWN) fired newsreader Mark Esterhuysen on Tuesday after he swore 13 times and promoted his blog, Twitter and Facebook feeds during a news bulletin.
EWN editor Katy Katopodis said he had been summarily dismissed.
Although she had been unable to reach Esterhuysen by phone, a letter of dismissal had been delivered to his house.
"We can't tolerate that kind of behaviour. I don't think it's appropriate to use our platform, which is credible, to promote your own agenda," she said.
A 41-second clip, purportedly of the broadcast, on the website twitvid.com had garnered 35,000 views by Tuesday afternoon.
In it a man who identifies himself as Mark Esterhuysen, says: "F-word racism, f-word the pigs who killed Andries Tatane, f-word the AWB, f-word racism. We are all wild animals here, meant to live free. F-word capitalism, f-word fascism. F-word this f-word wage slavery s-word. F-word domestication, f-word Julius Malema, f-word the state. F-word the petrol economic growth on a finite planet."
Esterhuysen tweeted that he had "no regrets about my bulletin".
On his Twitter feed, he identified himself as an enemy of the state, a defender of anarchy, a proud member of the primate clan, a cunning linguist, and a master debater.
"Just like Jerry Maguire, I have lost the ability to b-word. I'll accept the consequences of it," he tweeted on Monday.
He said all he wanted in life "is for @GarethCliff to read my blog".
His most recent blog on markesterhuysen.blogspot.com/ was on the role of sport in modern South Africa, from an anarchist perspective. Other topics dealt with the futility of civilisation.