"If you're logged into Facebook and visit a website with the Like button, your browser sends us information about your visit", Facebook says.
He parried questions of how much control people have over their data on the world's largest social media network without a major gaffe, while avoiding being cornered into supporting new government regulation.
"As this was the first time Mr. Zuckerberg has come to testify before Congress, Mr. McKinley wanted to use this opportunity to press him on the issue", he said. Cambridge Analytica then obtained the data and was said to have used it to try to influence elections around the world.
But in the wake of the Cambridge Analytica scandal and this week's hearings, lawmakers and the public are growing more concerned about Facebook's data collection practices.
Sen. Lindsey Graham started his line of questioning asking Zuckerberg to list Facebook's top rivals; Zuck tried to break out the company's competitors into categories (category No. 1: other tech platforms, aka Google, Apple, Amazon, Microsoft), but Graham dismissed that attempt with a auto analogy.
The admission during US House of Representatives testimony underscores the problem Facebook has in persuading politicians that users can safeguard their own information if they carefully manage their personal settings and that further legislation governing Facebook's use of data is unnecessary. The sessions also featured presentations from Facebook's researchers on privacy challenges, as well as ways the company might protect user data.
Sputnik: Zuckerberg's talking about the fact that we shouldn't overregulate social media and other tech companies.
Facebook's Mark Zuckerberg grilled by CA senators on first day of testimony
On a question if Facebook has a political bias, he said the platform's goal was not to engage political speech. Prepare to see footage of Cruz grilling Zuckerberg about political bias on every Fox News opinion show.
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And although the images don't reveal what's lurking under the hood, they shed light on what we can expect from the smartphone. Anyway, we can also see a power button to the right, volume controls on the left, and a mystery hardware button on the left.
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He even included Vladimir Putin, the Russian president in his rage against the chemical attacks on the civilians in Syria. President Trump also condemned the Iranian regime and the Putin government for their support of the Assad regime.
He also said Facebook does not collect information from users' verbal conversations through mobile devices' microphones.
"The claim that Facemash was somehow connected to the development of Facebook - it isn't, it wasn't, and Facemash isn't running", he said.
In both hearings before the Senate, Zuckerberg only mentioned two kinds of data: the information that people decide to share on the platform, and the data that is automatically collected about people's behavior.
The Cambridge Analytica issue was the reason Zuckerberg was on Capitol Hill, answering questions for the second time in two days about how the group - which has counted U.S. President Donald Trump's election campaign among its clients - got hold of data on many millions of Facebook users.
That's before we've considered whether the consent people give when the sign up to Facebook could be considered "informed", since it's unlikely many people read the 2,700-word data policy.
The social giants still say that they do not sell that data to anyone and the users can choose to opt out of it anytime they want. The Facebook chief executive told House members that he was part of the data breach. Also, maybe you don't want to wait around for Facebook to get to your account's notification.
"It's pretty obvious to me that someone is listening to the audio on our phones", Buschon said.
"You don't feel you have a monopoly?"