Facebook CEO Mark Zuckerberg testifies before senators on data scandal

Mark Zuckerberg faced senators eager to question the Facebook CEO over concerns that might lead to regulation of the giant social media platform he founded 14 years ago.
3:17 | 04/10/18

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Transcript for Facebook CEO Mark Zuckerberg testifies before senators on data scandal
Cost town in Washington it was FaceBook CEO Mark Zuckerberg feeling the heat what he said today to congress. Andy the American people to the millions who are on FaceBook. You're about to hear Zuckerberg grilled by members of the US senate asked about your personal information getting into the wrong hands. ABC's Barry Bruce was right there in the room. Embattled FaceBook CEO Mark Zuckerberg entered a packed hearing room stepping into the congressional hot seat for the first time. The 33 year old who invited billions to trust him with their personal information on his social network began with an apology. We didn't take a broad enough view of our responsibility. And that was a big mistake. It was my mistake. I'm sorry. I just let senators weren't satisfied. After more than a decade of promises to do better how we as today's. Apology different so we have made a lot of mistakes in running the company. Zuckerberg was grilled about why Cambridge analytic the political consulting firm hired by the 2016 trump campaign. With able to improperly harvest the personal information. Of 87 million FaceBook users. Were these people out at 87 million people users. Concentrated in certain states are you able to figure out where they're from I do not have that information. With me. But hobby but we can follow up we hear your office OK because as we now they have election was close and that was only the thousands of votes in certain states. Again and again he was pressed over whether FaceBook protects its users' privacy. Mr. Zuckerberg. Would you be comfortable sharing with us the name of the hotel you state in last thing. No. I think that may be what this is all about. Your right to privacy. On Russian interference in the election he admits they were slow to respond nearly 146. Million users were exposed to ads planted by Russian groups this is an arms race. When they're gonna keep on getting better that's and we need to invest in keeping I'm getting better it's too and then this think now apartment. If you were a human face put that you reviewed by the special counsel's office yes you've it is viewed I have not. But I know we're working with. He also signaled he's willing to work with lawmakers pushing for more robust regulations like those in Europe there are you as a company welcome regulation. I think if it's the right regulation and you think the Europeans have it right I think that they get things right if he ever submitted. Servers for this live from the hill tonight and testimony still under way marry you reported last night. That FaceBook it promised to send millions of users here in the US alerts revealing whether their own personal information. Have been obtained by Cambridge analytic is that happening. David those updates have started to trickle into some people's feeds but the full roll out still is not complete tonight no word on why this delay while. Here in this hearing room tonight the overarching response from lawmakers is that Zuckerberg cannot regulate himself. The congress has to do more to step in. David Mary Bruce of that packed room right behind her Mary thank you.

This transcript has been automatically generated and may not be 100% accurate.

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