https://www.cnbc.com/2018/04/10/watch-facebooks-mark-zuckerberg-testify-before-congress.html >Mark Zuckerberg is testifying at a joint hearing of the Senate Judiciary and Commerce committees Tuesday, in the first of two congressional hearings for the Facebook founder and CEO. >The company is facing questions following reports that research firm Cambridge Analytica improperly gained access to the personal data of as many as 87 million Facebook users.