How Twitter polices speech on its platform is, assuming it remains within the law, up to Twitter. If those who run the company wish to do so in a way that offends our notions of free expression, that is, with one crucial exception, solely up to them. Twitter is privately owned, and the U.S. government has no business regulating how legal conversations are supervised behind the company’s virtual walls. Nor, for that matter, should any “independent” body be set up under the auspices of the state to review Twitter’s speech policy.