Zuckerberg testified amid a firestorm over the alleged hijacking of data of millions of Facebook users by London based firm Cambridge Analytica.
At the hearing, Zuckerberg said: "We didn't take a broad enough view of our responsibility, and that was a big mistake".
More than 70 million of the affected users are in the U.S., Facebook said, and there are more than a million each in the Philippines, Indonesia and the United Kingdom.
Bear in mind that the notification, though it was rolled out last night, may take some time to reach all of Facebook's more than 1.8 billion users.
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One of the senators, John Thune from South Dakota, told Zuckerberg that his company had a 14-year history of apologising for "ill-advised decisions" related to user privacy.
As a result, the issue that was supposed to be the focus of the hearing - "social media privacy and the use and abuse of data", as Sen. Dean Heller told Zuckerberg. One of those being that everyone globally on their Facebook page will see an alert leading them to the apps setting where they can review the apps they've allowed access to their data.
But it still bothered West, who directs the Center for Technology Innovation at the Brookings Institution in Washington.
The hearing was a effect of a New York Times report stating that a data firm called Cambridge Analytica, which did work for Donald Trump's presidential campaign, exploited a data breach of 50 million Facebook users. Dan Sullivan, R-Alaska, that "I'm not the type of person who thinks that all regulation is bad". It was providing a gold mine for the candidates who use it.
Zuckerberg is on Capitol Hill this week to face a barrage of questions from lawmakers looking to probe the tech giant over concerns about privacy, data collection, and more.
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"We want to encourage people to manage the apps they use".
Apparently to increase transparency, accountability and maybe prevent election interference, Facebook also announced changes to the way advertisements are managed both on its platform and on Instagram. The company has said that as many as 146 million people may have received information from a Russian agency that's accused of orchestrating much of the cyber meddling in the election.
"We expected them to do a number of more traditional cyber attacks, which we did identify and notify the campaigns that they were trying to hack into them", he said.
Facebook scans pictures and texts that users send each other on its Messenger app "to ensure they are in line with Facebook's community standards", Mr Zuckerberg confirmed. Bagnetto said he found that information useful.
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