Orange Gestapo “Homeland Security” has opened up a 60 day comment period for plans to collect Social Media accounts for anyone with a Visa or Greencard.
Link to provide Homeland Security with feedback is in the article as well as here.
Leave feedback, though I’m highly doubtful it will make any difference.
For visitors yeah it already exists. I think what they want to do now is collect from people who are already inside the US, like applying for permanent residency, etc.