Pressuring the billionaire CEO even further, Democratic congresswoman Anna Eshoo asked him a simple question: "Are you willing to change your business model in the interest of protecting individual privacy", she said.
Shares are down 16% from the all-time high that they hit before the Cambridge Analytica data scandal, which Facebook now says has affected 87 million users, first came to light. "And how much you give away in modern America in the name of, quote, connecting people around the world". "In retrospect it was clearly a mistake to believe them", he said.
35% said they were using Facebook less than they used to over the privacy issue.
The security reason: "It's to make sure people can't scrape public info from Facebook even when they're not logged in". That fits a concern among some on the right that Facebook penalizes conservatives under the cover of hate speech and safety standards.
Facebook said that the minimum reward for reports that are proven true is $500.
So Zuckerberg, who owns more than 401.4 million shares in Facebook, got almost $3 billion richer in the past few days.
"I do imagine that we will find some apps that were either doing something suspicious or misusing people's data", he said. And Facebook is just one of countless companies that track our online trails for profit.
While it doesn't make up for anything, Facebook now offers users the opportunity to see whether you or a friend have accessed the app, and whether your information could have been collected.
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Others noted however that lawmakers had demonstrated little knowledge of how Facebook works - potentially complicating any regulatory effort.
Noting that a European data protection standard due to come into effect on May 25 was more stringent than what was now in place at Facebook, Zuckerberg suggested it could serve as a rough model for USA rules in the future. We're guessing he's distracted by the billions of dollars Facebook earns trading in information it gathers from us, information we might naively have thought was private.
Either way, Milanesi writes that lower engagement is actually the real risk for Facebook, not necessarily people deleting their accounts.
Lawmakers also raised the issue of "shadow profiles", referring to data kept by Facebook that goes beyond people's Facebook activity or covers people who don't have Facebook profiles.
Zuckerberg tried to defend the Facebook policy on this tracking of all internet users and not just Facebook users by saying that everyone does it and that this is how the ad industry works.
Data released by technology company 4C revealed that ad spend is rocketing across all the major social media platforms.
The fact that Zuckerberg did not provide lawmakers with a clear answer about the extent of its data collection is notable because much of that information is readily available on Facebook's Help page. A founding member of right-wing outlet Breitbart News, Bannon is a former board member of Cambridge Analytica and brought in wealthy businessman Robert Mercer as a financial backer.
"No, Congressman", Zuckerberg said.