The U.S. District Court for the Northern District of California has ruled, in Music Group Macao Commercial Offshore Limited v. John Does, that Twitter is not required to reveal the identity of two anonymous users who allegedly posted disparaging remarks about a music holding company.  The court rejected Music Group’s motion to compel Twitter to comply with two subpoenas requesting the names, addresses, email addresses and any proxy addresses of the users, finding that the plaintiffs did not establish a sufficient evidentiary basis for their defamation claims as to some of the comments, and that the harm to the plaintiffs from other comments was outweighed by the harm that identifying the Twitter users would cause to their free speech rights.  The decision is another example of some courts’ reluctance to unmask anonymous posters absent a strong showing of serious wrongdoing.