Shares of Facebook surged 4.5% on Tuesday as CEO Mark Zuckerberg prepared to testify in front of Congress. Zuckerberg’s visit to Capitol Hill was highly anticipated, so let’s take a look at what the embattled CEO has said so far, and how the world has reacted.

The social media powerhouse has seen its stock price tank over the last month based largely on its handling of the Cambridge Analytica scandal. Zuckerberg now faces two days of congressional hearings, while Silicon Valley and much of the investment world hold their collective breath to see how lawmakers treat Facebook and its potential data security concerns.

Investors got a preview of what Zuckerberg might say during his congressional testimony with the release of his prepared remarks Tuesday.

“It's clear now that we didn't do enough to prevent these tools from being used for harm as well. That goes for fake news, foreign interference in elections, and hate speech, as well as developers and data privacy,” Zuckerberg wrote. “We didn't take a broad enough view of our responsibility, and that was a big mistake. It was my mistake, and I'm sorry. I started Facebook, I run it, and I'm responsible for what happens here.”

With that out of the way, let’s turn our attention to Tuesday’s testimony and how it has been viewed via the lens of Twitter .

Source tells me Zuckerberg participated in 4 full mock hearings in preparation for this testimony before Congress #Zuckerberg

— Savannah Guthrie (@SavannahGuthrie) April 10, 2018

Mark Zuckerberg’s view as he sits down for his congressional testimony pic.twitter.com/F0QZokbL1b

— Monica Alba (@albamonica) April 10, 2018

Halftime report of the #Zuckerberg Testimony:
Facebook up 4.50%
Congress trailing by a decade.

— Todd Gardner (@toddhgardner) April 10, 2018

Re #Facebook and #ZuckerbergTestimony: I think these Senators have forgotten that everyones name, home address, and phone number used to be printed in books, updated annually, and thrown on their front porch for free ????

— Justin Margolis (@jmargolis88) April 10, 2018

.@SenatorDurbin just punked Mark #Zuckerberg "will you tell us what hotel you stayed at last night, would you tell us the names of the people you messaged in the last week?" #Zuckerbergtestimony https://t.co/FYaWTiUlGK

— Ahmed Bedier (@bedier) April 10, 2018

Zuckerberg has probably burned a full five minutes—i.e. one Q&A session—by thanking senators for their leadership and praising the quality of their questions. Congressional testimony 101.

— Lachlan Markay (@lachlan) April 10, 2018

Interesting line of questioning from Sen. Sullivan of Alaska: is Facebook too powerful? Would regulating it a la Dodd-Frank actually entrench it and keep newer entrants from succeeding? Then asks, "are you a tech company, or the world's largest publisher?"

— Kevin Roose (@kevinroose) April 10, 2018

This whole Cambridge Analytica debacle really highlights how digital media illiterate people are. #Zuckerberg in front of the senators really highlights how people just don't know how the internet, and by extension Facebook, works. #Zuckerbergtestimony— Sam Lalonde (@sam_lalonde) April 10, 2018

Mark Zuckerberg: ???What we???re going to do is require a valid government identity, and we???re going to verify the location. So, we???re going to do that so that way someone sitting in Russia, for example, couldn???t say that they???re in America, and therefore able to run an election ad.??? pic.twitter.com/O5RVyFqbZ5

— Fox News (@FoxNews) April 10, 2018

After questioning Mark Zuckerberg, Senator Graham told reporters that he thought the Facebook CEO was “like Jell-O” on regulations https://t.co/LnsY5R3gKq pic.twitter.com/rt5cOvCtXu— CNN (@CNN) April 10, 2018

It's notable that even Cory Booker is grilling Zuckerberg now. Booker was the pro-tech mayor who convinced Zuckerberg to give $100 million to the Newark schools during his "Social Network"-era image rehab campaign.

— Kevin Roose (@kevinroose) April 10, 2018

It's been 3 hours. We're on the final stretch of the first of Mark Zuckerberg's 2 marathon hearings before Congress. https://t.co/riGZMlmuQc pic.twitter.com/UhqXPKZ5QE

— The New York Times (@nytimes) April 10, 2018

Sen. Dan Sullivan asks Mark Zuckerberg, "Is Facebook too powerful?" Zuckerberg didn't say yes or no https://t.co/kFK0R3exVE pic.twitter.com/8vp2csR8Rj

— CNN (@CNN) April 10, 2018

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