True, but I suspect we will see other countries do the same, not as retaliation, but more because they'll want catch up to the US in terms of border security ...and it will become a normal thing except in third world counties too inept or poor or corrupt to care to implement this where the dissidents will be free from hassle, for a while.

The world is going through it isolationist phase so yes it is likely other countries will do the same. Though in the future I am seeing a possibility where governments ask for your social media handles and all that data is trawled using an ai which assess your risk profile according to the needs of the government asking the questions. Instead of all your private data getting into the hands of the government or outside third party it accessed and processed by an AI. Personally I would not mind such an AI scanning my profile data as long as the parameters of the questions are already set and the data is not seen by any humans.

This will have a broad chilling effect. You can't deviate from the norm anymore. I would be worried very much if my fate lies in the hands of an AI where there is neither transparency nor recourse.

You dont have a recourse with immigration officers who can be a racist homophone or have any other hangups to reject your entry to a country. But if its AI it is more likely to look at what is relevant such as are you going to overstay or have nefarious reasons to enter. Nothing to do with your race sexual orientation or religion.

There is already no recourse in the immigration system.

I had a Facebook account before Bush won his second election, in 2004.