Zuckerberg described Facebook as an "idealistic and optimistic company" which focuses on the positive aspect of connecting people.
But senators showed no sign of doing anything as useful as that, so Zuck's net worth has soared. We didn't take a broad view of our responsibility and that was a big mistake.
"It was my mistake, and I'm sorry", he said, in words from a prepared statement. To me, one of the most interesting developments was that Mark Zuckerberg acknowledged that Facebook could charge users in the future instead of seeing advertisements.
"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. This will confirm whether or not your personal data was accessed by the firm, and will detail what information the company may have obtained.
"It's clear now that we didn't do enough to prevent these tools from being used for harm", Mark Zuckerberg told senators.
Given the fallout from the Cambridge Analytica data breach scandal, it was expected the Facebook founder would eventually find himself in the hot seat. not a "booster seat".More news: Salah sends Liverpool into semis
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When asked when Facebook learned of Russian influence operations on the social network, Zuckerberg said, "Right around the time of the 2016 election itself".
He denied that Facebook, which has more than 2 billion monthly users across the world, was a monopoly.
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 United States election.
"They're going to keep on getting better at this - and we need to invest to keep getting better at this too".
His notes, which the AP said were "briefly visible" to one of its photographers, include bulleted lists with headings such as "accountability", "data security", "election integrity (Russia)" and "Defend Facebook".
In 2014, a personality quiz application invented by Russian academic Aleksandr Kogan, called "This is Your Digital Life", used Facebook to gain access to users' and their Facebook friends' public profiles including their page likes, birthdays, places of residence and private messages.
"We deserve the right to our privacy and our information", Williams said.