New US visa rules will force foreign students to unlock social media profiles

The country of free speech, everyone!

You are free to say whatever you like, as long as your words do not contradict Official Party Ideology.

Rights don't apply when you are entering another country. Americans have the right to bear arms too, but good luck with that argument when get caught at the border with weapons.

Rights always apply, always. This is the thing about human rights enshrined in human rights laws in places like the EU, or about your constitutional rights (although the latter only applies to US citizens and to people physically present in the US).

However, countries may, depending on their laws, choose to not let certain people in on conditions that would otherwise violate guarantees on freedom of speech etc.

However, you do have your constitutional rights at the border etc. There is an exception concerning searches.