The questioning focused largely on understanding what is Facebook: A behemoth that is an "extraordinary American company", as one senator put it? The appearance followed the revelation that data from as many as 87 million users was siphoned to Cambridge Analytica, a British firm with ties to the 2016 campaign of President Donald Trump. Among the numerous items on the agenda were data ownership and access and privacy rights. Although the hearing was sparked by the Cambridge Analytica data scandal, the questions ranged far and wide as lawmakers sought to get their jabs in-all while struggling to understand Facebook and its business model.
The Tennessee lawmaker cited laws that govern health data, financial transactions and other industries, before citing her bill that would require tech companies to obtain user permission before they can collect and sell user data. He asked Zuckerberg which parts would be appropriate for the U.S.to adopt as well, and the Facebook CEO said he agrees with having some type of controls or Facebook regulation, especially when it comes to sensitive technology like facial recognition.
Once again wearing a dark suit instead of his usual grey T-shirt, Mr Zuckerberg took questions for almost five hours in a US Senate hearing without making any further promises to support new legislation or change how the social network does business, foiling attempts by senators to pin him down.
They also pressed him on topics including drug sales on Facebook, supposed censorship of conservative voices on the platform, the concept of self-regulation in the tech world, and the Cambridge Analytica scandal, the reason for the congressional hearings in the first place.
A day earlier, Zuckerberg batted away often-aggressive questioning from senators who accused him of failing to protect the personal information of millions of Americans from Russians intent on upsetting the US election. You want to know what Nordstrom sees so that specific jumpsuit just keeps popping up on your newsfeed?
Jim Carrey posted a cartoon drawing of the social network boss as an extraterrestrial visiting from "planet Zuckerberg" to destroy Earth.
4C's research also found that with consumers increasingly consuming media through two or even three screens, brands were responding by adopting "audience first strategies". Zuckerberg wants to talk about another.
Questioning was considerably more aggressive and informed on Wednesday than at a five-hour hearing on Tuesday before two Senate committees.
Zuckerberg was called to appear in front of a house of US Senators who were trying to decide whether Congress should intervene with regulations on Facebook.
Zuckerberg said it would take "many months" to complete an audit of other apps that might also have improperly gathered or shared users' data.
Barton had asked about what data Facebook shares with third parties about people under the age of 18.
Facebook's shares are down 11% since the news of the breach, though wider recovery in the markets helped them bounce back by 4.5% on Tuesday.
Senator John Thune, a Republican from South Dakota, asked Zuckerberg if he is willing to make a commitment to protect political speech from "all different corners".
Representative Mike Doyle, a Pennsylvania Democrat, said, "The only way we're going to close this trust gap is through legislation that creates and empowers a sufficiently resourced expert oversight agency with rule-making authority to protect the digital privacy and ensure our companies protect their users' data". But that doesn't mean it doesn't profit from it. By default, Facebook shows you ads based on interests you've expressed over the years and the companies you have "interacted" with - for instance, by sharing your email or phone number, visiting their website or using their app.
Facebook deleted tens of thousands of fake accounts and will investigate tens of thousands of apps that use the platform to identify any other potential breaches. The results are really shocking to see and give an idea of the lengths the social website goes to collect your personal data.
"The FTC last week said that Facebook isn't taking enough steps to remove opioid listings", McKinley said.
Those included claims that Facebook lets you download your data and take it elsewhere; that users can turn off data collection for advertising purposes; and that Facebook tracks users even when they're not on Facebook itself, but only for "security purposes".