Facebook Restricts Speech by Popular Demand

This past week, with some fanfare, Facebook announced its own version of the Supreme Court: a 40-member board that will make final decisions about user posts that Facebook has taken down. The announcement came after extended deliberations that have been described as Facebook’s “constitutional convention.”

We don’t usually use sweeping terms such as Supreme Court and constitution to describe the operation of private companies, but here they seem appropriate. Internet platforms such as YouTube and Facebook have been called the modern public square. That description understates the platforms’ importance for...