In some countries that might be true, but not in the US. Free speech protections apply to everyone within US borders, not just citizens. US courts have repeatedly interpreted the First Amendment to mean any person physically present in the United States, including foreign visitors, tourists, and undocumented immigrants, are protected.
I would have strongly argued in the past that the big advantage of US constitution is that nobody would need to be cautious about what political speech they post on social media and online.
I would have strongly argued in the past that the big advantage of US constitution is that nobody would need to be cautious about what political speech they post on social media and online.