Facebook founder and CEO Mark Zuckerberg will appear on Capitol Hill on Tuesday. The social media giant is at the center of an ongoing dispute over the alleged harvesting and use of personal data. The allegations have heightened concerns over whether such data was then used to try and influence the outcome of the 2016 U.S. presidential election and the Brexit vote. Facebook is desperately trying to mend its damaged reputation following the continued fallout of a massive data scandal. The tech behemoth ended up in the midst of a media firestorm.”]