Freedom of expression is the engine oil that makes democracies function?

Why are private companies allowed to ban users from their social media platforms? What does Catherine Ross mean when she says that “freedom of expression is the engine oil that makes democracies function?

3. What was the outcome of the 1969 case Tinker v. Des Moines? Why do experts say this is one of the most important school-related First Amendment rulings?

4. What is the legal rationale behind teen curfews and why does the First Amendment permit them?

5. Opinion/Commentary on the article/issues.