Paul Alan Levy of Public Citizen writes:
In a decision issued today, the California Second District Court of Appeal has created an additional way for anonymous speakers, and for web operators who host anonymous comments, to protect the right to speak anonymously. Instead of invoking the First Amendment as courts in other states, and indeed other appellate courts in California have done, the Court of Appeal reversed an order compelling the identification of an anonymous speaker because the discovery order violated the state constitutional right of privacy.
Read more on Public Citizen.
h/t, The Volokh Conspiracy.