Facebook CEO Mark Zuckerberg will testify before Congress today and tomorrow. This hearing is, in my opinion, hugely significant, since it will dictate the course that the United States ultimately chooses with respect to regulation of social media content. In Europe, such regulation is widespread and generally accepted as legitimate by large segments of the public and lawmakers. While there are those in Europe who vocally criticize the censorship of social media, they are generally people who are not in a position of power to do much to create change. The United States presently enjoys a fairly open environment for online expression, but there are many in this country who would like to have the US government establish regulatory oversight of social media companies with respect to what content users are allowed to display. With this in mind, the potential impact of any legislation will be substantial. Here’s what to expect.