It's not just students btw... we're dealing it this too. My wife is a Korean university professor teaching at an American university, and her visa needs to be renewed by next month. I'm Canadian and she has residency in Canada but the Korean embassy in Canada advised her to travel back to Korea to renew it. She got back to Korea end of May to find that the US embassy in Korea had paused appointments. Monday last week she was able to make an appointment for it, and indeed she was advised her social media will be screened.