When you comment, your IP address is logged. If you have legitimately defamed someone or you have done anything else to deliberately cause harm to another person, I can and will provide your IP address and any other personal information I gather to any interested person. If you are an incredible douchebag (in my sole opinion), I have no qualms about publishing your IP address.
On the other hand, if you behave, your information will be protected. I will never sell your information to anyone for a commercial purpose nor for any other reason without prior permission from you. Revealing your identity for profit — that’s something that we don’t do. Revealing your identity to expose a douchebag — yeah, we do that.