Facing a grilling: Facebook's Mark Zuckerberg testifies before Congress. DW's Michael Knigge has the storyTo view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video04/10/2018April 10, 2018Brent Goff speaks to DW's Michael Knigge on Capitol Hill about Mark Zuckerberg's testimonyhttps://p.dw.com/p/2voogAdvertisement