VIDEO: Calif. Senator Kamala Harris questions Facebook's Mark Zuckerberg

I've been here on and off for the last four hours that you've been testifying, and I have to tell you, I'm concerned about how much Facebook values trust and transparency, if we agree that a critical component of a relationship of trust and transparency is we speak truth and we get to the truth. During the course of this hearing, these last four hours, you've been asked several critical questions for which you don't have answers. Those questions have included whether Facebook can track users' browsing activity even after the user has logged off of Facebook, whether Facebook can track your activity across devices even when you aren't logged into Facebook, who is Facebook's biggest competition, whether Facebook may store up to 96 categories of users' information, whether Kogan's terms of service and whether you knew that Kogan could sell or transfer data, and then another case in point specifically as it relates to Cambridge Analytica and a concern of mine is that you, meaning Facebook, and I'm going to assume you personally as CEO, became aware in December of 2015 that Dr. Kogan and Cambridge Analytica misappropriated data from 87 million Facebook users. That's 27 months ago that you became, as Facebook, and perhaps you personally became aware. However, a decision was made not to notify the users. So my question is, did anyone at Facebook have a conversation at the time that you became aware of this breach and have a conversation wherein the decision was made not to contact the users? Senator, I don't know if there were any conversations at Facebook overall because I was in a lot of them. On that subject. Yeah, I mean, I'm not sure what other people discussed. At the time, in 2015, we heard the report that this developer, Alexander Kogan, had sold data to Cambridge Analytica. That's in violation of our terms. Correct, and were you a part of a decision? Were you part of a discussion that resulted in a decision not to inform your users? I don't remember a conversation like that, but the reason why— Are you aware of anyone in leadership at Facebook who was in a conversation where a decision was made not to inform your users, or do you believe no such conversation ever took place? I'm not sure whether there was a conversation about that, but I can tell you the thought process at the time of the company, which was that in 2015, when we heard about this, we banned the developer and we demanded that they delete all the data and stop using it, and the same with Cambridge Analytica. They told us they had— I have written testimony in that regard, but I'm talking about notifications of users, and this relates to the issue of transparency and the relationship of trust, informing the user about what you know in terms of how their personal information has been misused, and I'm also concerned that when you personally became aware of this, did you or senior leadership do an inquiry to find out who at Facebook had this information, and did they not have a discussion about whether or not the users should be informed back in December of 2015? Senator, in retrospect, I think we clearly viewed it as a mistake that we didn't inform people, and we did that based on false information that we thought that the case was closed and that the data had been deleted. So there was a decision made on that basis not to inform the users, is that correct? That's my understanding, yes. But in retrospect, I think that was a mistake, and knowing what we know now, we should have handled a lot of things here differently. And I appreciate that point. Do you know when that decision was made not to inform the users? I don't. Okay. Last November, the Senate Intelligence Committee held a hearing on social media influence. I was a part of that hearing. I submitted 50 written questions to Facebook and other companies, and the responses that we received were unfortunately evasive, and some were, frankly, nonresponsive. So I'm going to ask the question again here. How much revenue did Facebook earn from the user engagement that resulted from foreign propaganda? Well, Senator, what we do know is that the IRA, the Internet Research Agency, the Russian firm, ran about $100,000 worth of ads. I can't say that we've identified all of the foreign actors who are involved here. So I can't say that that's all of the money, but that is what we have identified. Okay. My time is up. I'll submit more questions for the record. Thank you.