This is wrong. From CBS news:
Every U.S. immigrant's social media history could get new scrutiny starting Oct. 18.
The Department of Homeland Security (DHS) quietly introduced a new regulation last week that would allow the agency to collect data from all immigrants' social media history, including posts from their Facebook, Twitter and Instagram accounts. It would also affect green card holders and naturalized citizens. The new provision, introduced to the Federal Register on Sept. 18, was first spotted by BuzzFeed News