LIVE: Facebook hearing – Zuckerberg gives testimony to Senate committees (LIVE FEED)

He should be prepared for some hard question

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.

He 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.