Another group wore t-shirts with the hashtag #DeleteFacebook scrawled on them in red Sharpie.
In his opening remarks, Zuckerberg apologized for the use of Facebook by Russian operatives seeking to interfere in the 2016 US presidential election. In fact, the latest privacy scandal grew out of the revelation that a Trump-affiliated consulting firm, Cambridge Analytica, managed to get data on tens of millions of Facebook users through an app that was purportedly a research tool. That hearing that could easily run as long as Tuesday's affair, if not even longer. That wasn't necessarily a bad thing. Mark Zuckerberg was being trolled by a Russian Troll. The notice says the app misused the information, including public profiles, page likes, birthdays and current cities, by sharing it with Cambridge Analytica. So could you give me some sort of idea on how you can really, honestly say, it's it's my data when, quite frankly, they may have goods on me, I don't I don't want them to have any information on me. He answered questions for five hours in front of the Senate Commerce and Judiciary Committees.
Numerous senators' questions seemed to focus on Facebook's basic functions, such as its privacy settings and what it does and doesn't do with user data.
Facebook stocks rose 4.5 per cent on Tuesday, which is said to have swelled the entrepreneur's fortune by several billion dollars.
A majority of Facebook users describe their personal data as now unsafe, in that they feel it is possibly being given to people with whom they wouldn't choose to share it.
'You don't think you have a monopoly?'
Facebook boss Mark Zuckerberg testifies before US Congress over data privacy scandal
The crowded Senate hearing was not without theatrics, although most was from the audience, like an activist dressed in costume as a Russian internet "troll". But, as it turned out, Cambridge Analytica lied to Facebook.
"We didn't take a broad enough view of our responsibility - that was a big mistake". Zuckerberg stumbled as he rattled off names like Google, Apple, Amazon, and Microsoft. His remarks closely echoed what he and other executives have repeated in numerous blog posts and press interviews over the last week or so - and shows how Facebook has managed to largely stay ahead of lawmakers' questions.
Zuckerberg's appearance was apologetic in tone, as the youthful billionaire reels from accusations that he and Facebook's management were lax in protecting the privacy of users and allowing political advertisers access to their data.
"I made mistakes", the note said, under a bullet point labeled "Resign?" They share their connectivity with their family members.
Mr Zuckerberg: "Senator, no I would probably not choose to do that publicly here".
Just how much Mark Zuckerberg cares about his privacy?
"I understand where that concern is coming from because Facebook and the tech industry are located in Silicon Valley, which is an extremely left-leaning place", Zuckerberg replied. "I'm the first to admit that we've made a bunch of mistakes", read another from 2011.
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