In a related development, the political consultancy at the heart of the affair has announced its acting chief executive is stepping down. They have also been blamed for not taking enough action to prevent the spread of false news. Zuckerberg was asked repeatedly on Tuesday on how Facebook collects data from people as they navigate around the internet, whether or not they have Facebook accounts or are logged into them.
Zuckerberg said Facebook had been led to believe Cambridge Analytica had deleted the user data it had harvested and that had been "clearly a mistake". "And if we find any suspicious activity, we're going to conduct a full audit of those apps to understand how they're using their data and if they're doing anything improper".
"Our researchers have been publishing such research since 2013 in major peer-reviewed scientific journals, and these studies have been reported widely in global media", it added.
"We continue to have these abuses and these data breaches", DeGette said.
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The social media company, he said, is not aware of any specific groups like that, that have engaged in the white supremacist rally in Charlottesville a year ago.
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"There are people in Russian Federation whose job it is to try to exploit our systems and other Internet systems and other systems as well", he said.
Besides, Vaidhyanathan said, he pays ISPs, cable companies and newspapers "hundreds of dollars a month", and "they grab as much data as they can".
Alexander Nix, who had been in charge until March, remains suspended. "This incident yet again shows that our laws aren't working", said Frank Pallone, the ranking member of the house committee on energy and commerce, in his opening remarks.
Tight privacy by default?
House lawmakers were a bit tougher on Zuckerberg than their colleagues in the Senate, many of whom seemed confused by the company and what it does.
"I hope not", he responded.
"I'll have my team follow up with you so that way we can have this discussion across the different categories where I think this discussion needs to happen", Mr Zuckerberg told a joint hearing by the US Senate's Commerce and Judiciary committees, when asked what regulations he thought were necessary. Now, you know that and I know that. "To the contrary, our goal is to be a platform for all ideas", Zuck said.
Another Republican pulled a surprise by displaying photos of illegal adverts for opioid drugs that he said had been live on Facebook yesterday.
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By Todd Shields, Sarah Frier and Ben BrodyMark Zuckerberg was confronted Wednesday by lawmakers scoffing at his apologies over lapses in protecting user privacy and pledges to do better, with one member asking, "Who's going to protect us from Facebook?".
"While Facebook has certainly grown, I worry it has not matured".
Facebook on Monday said: "Our goals are to understand Facebook's impact on upcoming elections - like Brazil, India, Mexico and the United States midterms - and to inform our future product and policy decisions".
But he professed not to be familiar with the term "shadow profiles" despite it having been used widely by the media during a past Facebook data privacy controversy.
Edwards said earlier this week 63,724 people in New Zealand may have been caught up in the data breach.
Review which apps have access to you data in your Facebook settings, which is accessible by clicking on the down arrow in your Facebook toolbar.
"Would you be comfortable sharing with us the name of the hotel you stayed in last night?"
Some of the lawmakers talked to Zuckerberg, 33, as they would their children or grandchildren, and were occasionally befuddled by the complexities of his company.
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