Incidentally, I do not expect PZ to lose his pajamas to the Pivar writ.
Defamation suits generally require a demonstration of harm. PZ verbally assaults people more or less on a daily basis, and who can really claim to have been harmed thereby other than himself?
Had he thought of choosing his targets more carefully and aiming more accurately, he might run risks that are not foreseen in the present case.
Let the Internet police itself.