The Department of Homeland Security is expanding its efforts to identify Americans who oppose ICE by sending tech companies legal requests for the names, email addresses, telephone numbers and other identifying data behind social media accounts that track or criticize the agency. Our tech reporter explains what to know. Video by Sheera Frenkel, Christina Thornell, Valentina Caval, Thomas Vollkommer, Jon Hazell and June Kim/The New York Times #ICE #tech #socialmedia #DHS #trump