The internet magnate is scheduled to testify at 10 a.m. EDT (1400 GMT) before the U.S. House of Representatives Energy and Commerce Committee, a day after he appeared for almost five hours before a U.S. Senate hearing. However, Zuckerberg's answer to that was - "It certainly doesn't feel like that to me".
Bucshon asked if Facebook is listening to conversations, or if it has contracts with companies that provide data that is acquired verbally. Michigan Democrat Debbie Dingell also requested that data be provided about Facebook like buttons, share buttons, and code on sites other than Facebook that could potentially be used to collect data on non-users.
Zuckerberg has taken questions on a range of issues, from fake news and terrorist content to Russian propaganda and data privacy, as USA lawmakers consider possible regulatory remedies.
While yesterday's hearing involved a pair of Senate committees, today's testimony was for the benefit of the House Committee on Energy and Commerce.
Representative Greg Walden of OR, the House panel's Republican chairman, said Zuckerberg needed to account for "alarming reports of breaches of trust between your company - one of the biggest and most powerful in the world - and its users".
"We expected them to do a number of more traditional cyber-attacks, which we did identify and notify the campaigns that they were trying to hack into them", he said.
"I think that might be what this is all about", said Mr Durbin. Facebook has over 20 crore users in the country.
Just before Zuckerberg sat down at Capitol Hill, Facebookannounced its new Data Abuse Bounty program to reward people who report any misuse of data by app developers.
This kind of policy isn't unique to Facebook - many other companies, such as Netflix and Spotify, routinely mine data to market people's information. He fielded Senator Lindsey Graham's questions regarding whether Facebook was a monopoly by, "Doesn't feel like that to me".
Facebook shares closed up 1.2 percent on Wednesday after dips earlier in the day. Last week, Facebook revealed that after conducting an internal analysis, it now believed the data of up to 87 million users - a lot of them in the USA - had been accessed by Cambridge Analytica.
"And people have the ability to see everything that they have in Facebook, to take that out, delete their account and move their data anywhere that they want", he said. "Even if someone isn't logged in, we track certain information, like how many pages they're accessing, as a security measure", he said. Earlier this year, special counsel Robert Mueller charged 13 Russian individuals and three Russian companies in a plot to interfere in the 2016 presidential election through a social media propaganda effort that included online ad purchases using US aliases and politicking on USA soil.
Going forward, it's unclear how Zuckerberg's testimony will affect his and Facebook's public image.
Zuckerberg said Aleksandr Kogan shared information with "a handful" of third parties.
Earlier this year Mueller charged 13 Russian individuals and three Russian companies in a plot to interfere in the 2016 presidential election through a social media propaganda effort that included online ad purchases using US aliases and politicking on USA soil.
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