He's about two billion pounds richer after yesterday's hearing - with Facebook stock (of which he has loads) rocketing in value.
In January, Zuckerberg said that Facebook took action to reduce deceptive content, and that those changes had already reduced time spent on the site by 50 million hours per day, or 5 percent.
"I made mistakes", the note said, under a bullet point labeled "Resign?" We also learned that a lot of the legislators responsible for regulating Facebook don't fully understand what Facebook is - or how it works.
"We face a number of important issues around privacy, safety, and democracy, and you will rightfully have some hard questions for me to answer", Zuckerberg said.
"It's clear now that we didn't do enough to prevent these tools from being used for harm", he said in prepared testimony released before his appearance. And I think it's one of the reasons why we struggle with it.
"There are people in Russian Federation whose job it is to try to exploit our systems and other internet systems".
'Underdogs' give Champions League much-needed shake-up
Meanwhile, the Reds fan was reported to have jubilated when Salah pulled one back in the midst of Manchester City's supporters. Roberto Firmino then sealed a win for the ages for the Reds, allowing them to make another Champions League semi-final.
It also alleged Facebook failed to notify users - doing so only after news reports disclosed the breach - and did not ensure the stolen data was destroyed.
After Facebook revealed that Cambridge Analytica (CA), AggregateIQ and other companies had improperly collected data on 87 million Facebook users, people around the world waited in uncomfortable anticipation for a notification from Facebook that their personal data had been acquired and sold by Cambridge Analytica.
He was also asked about the alleged abuse of the social media platform by Russian groups to interfere in the 2016 United States presidential elections. According to Greene, the program is meant to reward people who can spot and report data breaches of app developers on Facebook's platform.
On the subject of fake news, Zuckerberg said one of his "greatest regrets" in running the company was its slowness at uncovering and acting against disinformation campaigns by Russian trolls during the USA election.
"Across the board, we have a responsibility to not just build tools but to make sure that they're used for good". "And when we address these challenges, I know we'll look back and view helping people connect and giving more people a voice as a positive force in the world".
Johnson: So it's kind of safe to say that Facebook users don't seem to be overly concerned about all these revelations, although obviously Congress apparently is? "They're going to keep getting better", he said.