Alina Selyukh April 10, 2018 Updated April 10, 2018 20180410_atc_facebook_founder_and_ceo_mark_zuckerberg_testifies_on_capitol_hill.mp3 Listen • 6:09 20180410_atc_facebook_founder_and_ceo_mark_zuckerberg_testifies_on_capitol_hill.mp3 Copyright 2018 NPR. To see more, visit http://www.npr.org/. Alina Selyukh
