Facebook alerts users who had data harvested by Cambridge Analytica

Zuckerberg delivers a keynote during the Facebook f8 Developer Conference at the San Francisco Design Center in San Francisco in this file

Zuckerberg delivers a keynote during the Facebook f8 Developer Conference at the San Francisco Design Center in San Francisco in this file

"I started Facebook, I run it, and I'm responsible for what happens here", he told the joint hearing of the Senate judiciary and commerce committee. Facebook's shares rose almost 5 percent Tuesday. From how the man of short stature used a booster seat while addressing the questions to hilariously changing the closed captions of Zuckerberg and senator Chuck Grassley, meme makers seem to have had gone to town.

"I think that you would probably agree that we should remove terrorist propaganda from the service".

Facebook's chief operating officer, Sheryl Sandberg, said something similar to NBC last week: "We don't have an opt-out [of ads] at the highest level".

As for consumers, while the banishing of third-party data may be the first in a number of steps designed by Facebook to show it respects user privacy, will consumers notice this move in the day-to-day of memes, emojis and Facebook ads?

He said Zuckerberg has a responsibility to ensure his dream "doesn't become a privacy nightmare" for millions of Americans.

Once again, Mark Zuckerberg is sorry.

Here are top quotes from Zuckerberg, and some of the dozens of senators who grilled him.

"We're working on this", Zuckerberg responded.

Facebook later limited the data apps can access, but it was too late in this case. This is as it warns that users should manage apps that they use and control access to the data those apps can see.

Facebook is now embroiled in a widening scandal that a British data firm called Cambridge Analytica had improperly gathered detailed Facebook information on 87 million users, up from a previous estimate of more than 50 million. But he said "policing" Facebook isn't going to be easy because the ability of AI to identify the difference between political debate and hate speech is five to 10 years away. The executive appears before a House committee later today.

- Do you ever fire anyone?: Yes; hold people accountable all the time; not going to go into specifics. "Furthermore, it's important for us to tell people if and how their data may have been accessed via This Is Your Digital Life", he added.

For the most part, his careful but generally straightforward answers, steeped in the sometimes arcane details of Facebook's underlying functions, often deflected aggressive questioning. Zuckerberg, however, said he was not personally questioned.

One such exchange: Senator Orrin Hatch, R-Utah, asked Zuckerberg how Facebook makes money. However, what got Twitter's attention were not his answers, but the way he looked.

As for Russian election meddling Sen. Patrick Leahy, D-Vt., who's served in the Senate since 1975. "I want to be careful here because our work with the special counsel is confidential and I want to make sure that in an open session I'm not revealing something that's confidential", Zuckerberg replied. Zuckerberg was asked whether Facebook was a monopoly. Facebook has already confirmed that it will begin connecting with 87 million users including 562,455 in India to notify them about the data breach.

The 33-year-old founder of the world's best-known social media giant appeared in a suit and tie, a departure from the T-shirt he's famous for wearing in public as well as in private.

"There are people in Russian Federation whose job it is to try to exploit our systems and other internet systems and other systems as well".

He also said the company was in an "arms race" with Russian Federation, warning there were people in the country tasked with finding ways to breach Facebook's systems.

- Let's be clear: Facebook doesn't sell data.

When asked if Facebook would remain free, the billionaire said that a version of the social media platform would always remain free of cost.

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