Coming just weeks after Zuckerberg addressed the myriad of issues about data and politics raised from the Cambridge Analytica scandal, Schroepfer apologised for the way Facebook had handled inquiries from journalists working on the story.
As many as a million British Facebook users may have had their data harvested because they were connected to U.S. users targeted in data passed to Cambridge Analytica, Schroepfer said.
Facebook shares rose after the social network reported a surprisingly strong 63 per cent rise in profit and an increase in users, with no sign that business was hurt by a scandal over the mishandling of personal data.
Among these were Facebook's delay in understanding the impact of Russian influence in the United States election, its "mistake" not to inform people their data had been sold to Cambridge Analytica when it first found out about it in 2015, and Schroepfer accepted the initial system for policing apps on its platforms had failed.
"I understand, he has been getting requests from all over the world to come talk about this", Schroepfer said.
The EU's Parliament has asked Facebook CEO Mark Zuckerberg to testify at an upcoming hearing, but he has not committed to an appearance.
"We don't charge money for the platform", Schroepfer responded. The news eased investors' fears that advertisers would flee the platform after a backlash from users ー and Congress ー about the security of their personal information.
Facebook says it will tell people, in a notice at the top of their news feeds starting April 9, if their information may have been improperly shared with Cambridge Analytica.
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"We didn't take a broad enough view of what our responsibility was and that was a huge mistake". It now has an overall user base of more than 2.2 billion.
The company's main social network added users in North America, reversing the decline that happened for the first time ever in the fourth quarter.
You (Facebook) aren't an innocent party wronged by the likes of Cambridge Analytica.
"We're actually going to mark all political ads prior to the 2019 local elections, and explain who paid for them, and provide a lot more transparency".
Asked to provide further details on the individuals involved, Schroepfer said he had given "extensive information" to the Electoral Commission and the Information Commissioner but was hesitant to go further in public.
"The first step for Facebook was to show that the problem is contained", said Dan Ives, chief strategy officer and head of technology research for GBH Insights, a marketing research firm.
Cambridge Analytica was hired by Donald Trump's 2016 election campaign team, and MPs have also raised concerns over whether adverts on social media could have influenced the European Union referendum. The U.S. exec also managed to irritate the United Kingdom legislators when asked about the impact of political advertising.
Schroepfer's written evidence also revealed Facebook had investigated accusations around the involvement of data firm Cambridge Analytica in the 2016 Brexit referendum. Publishers, in particular, have complained that they've seen a sharp dropping off in the amount of traffic they're seeing from Facebook following the changes.