Congressperson: I don’t quite understand what Substack is. September 10, 2014 by Public User At the House hearing on the Weaponization of media, Rep. Sylvia Garcia (D-TX): You posted on your umm I guess it’s kind of like a web page. I don’t quite understand what Substack is. <https://youtu.be/ckw1PJ9e94I?t=105>