High Quality Content by WIKIPEDIA articles! Barrett v. Rosenthal is a 2006 California Supreme Court case concerning online defamation. The case resolved a defamation claim brought by Stephen Barrett, Terry Polevoy, and attorney Christopher Grell against women`s health advocate Ilena Rosenthal and several others. Barrett and others alleged that the defendants had republished libelous information about them on the internet. In a unanimous decision, the court held that Rosenthal was a "user of interactive computer services" and therefore immune from liability under Section 230 of the Communications Decency Act.