There may be more truth to this statement than we realize. I saw a story several days ago that Europe is trying to flex its muscles and regulate what constitutes acceptable speech. In turn this affects what can and cannot be on the internet. Many will say what does this have to do with the U.S., but having been a former regulator, I can tell you a lot. Many companies create their business practices to adhere to their strictest regulator. By doing this, they stay out of trouble with the jurisdictions that have looser regulatory environments. This works well in most cases, but not when it comes to individual rights where a country such as the U.S. has broad free speech and free press rights and Europe largely does not recognize these rights.
Yes, Facebook is a private company and they can set their rules in a way that they want. But when other countries or groups of countries begin to try and stifle our Constitutional rights by regulating what constitutes acceptable speech, it becomes a big deal.