Pietersen launched an attack on Nick Knight last Friday, questioning the former England opener's credibility as a Sky Sports pundit. The 31-year-old wrote: "Can somebody please tell me how Nick Knight has worked his way into the commentary box for the Tests?? Ridiculous."
Two years ago the ECB imposed a set of guidelines which players must adhere to. Players face being fined if they break the rules, but when asked if he was worried about being sanctioned, Pietersen said: "Not at all. I haven't seen (that story)."
When asked whether he would consider toning down his comments on the site, he added: "No, not at all, no. I won't stop tweeting, no."
Pietersen was one of the few players to come away with his reputation in tact from a torrid winter that saw England suffer whitewashes against Pakistan and India before some pride was restored to the number one ranked side in the world when they fought back to draw their two-Test series in Sri Lanka.
The Surrey batsman hit 151 in Colombo and has been successful in the shorter forms of the game of late, but could only manage 32 and 13 against West Indies at Lord's, where England emerged with a nervy five-wicket victory.
It was under-pressure captain Andrew Strauss who swung the game in England's favour with the bat thanks to his score of 122 - his first century since November 2010. Pietersen, who went two years without scoring a Test hundred, was delighted to see the 35-year-old return to form.
"I never doubted him, most definitely," said Pietersen. "Strauss is a fantastic guy and I was more happy for him scoring that hundred than I have been for any other team-mate when they have scored a hundred. I loved the fact that he did that.
"I have been through a period where I didn't score a hundred for a while and since then I have scored many. This sort of thing just happens. Someone is going to get criticised. That's just what happens in our job.
"He is a great bloke who has scored 19 Test hundreds and has captained England to home and away Ashes series. It was brilliant for English cricket that he got a hundred."