Rep. Bill Johnson, meanwhile, asked Zuckerberg why Facebook had rejected ads submitted by Franciscan University depicting Christ on the cross.
Responding to a question, Zuckerberg acknowledged that a lot of people probably just accept terms of service without taking the time to read through it.
Facebook has generated approximately $269.08 US per user profile from 2010 to the end of 2017. As many people know, Facebook tracks everything that you do inside the Facebook app and on a Facebook page when you are logged into the social media.
The flip side to all this is that anyone who owns shares in Facebook should be happy too, as they've gotten slightly richer also.
Google's tools were present in three in every five pages loaded, while Facebook's trackers were in a quarter of all page loads.
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Some Facebook users are considering logging off the site for good, and others already have.
The questioning focused largely on understanding what is Facebook: A behemoth that is an "extraordinary American company", as one senator put it? Erickson also reported that the company tried calling them twice on Tuesday.
In February, a Belgian court ruled that Facebook had violated European privacy law with such tracking because it hadn't obtained consent either to collect or store the data.More news: Amnesty Lauds Progress in Death Penalty Abolition
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"Data is the new oil", Kelly said.
Facebook has regularly been accused of listening in on conversations using microphones on smartphones and then presenting ads related to recent conversations to its users. But the United States lawmakers were still angry.
Facebook founder Mark Zuckerberg visibly seemed perturbed and defiant at the same time during the second and last day of his testimony to the US Congress on Wednesday.
Zuckerberg also confirmed reports on so-called shadow profiles, profiles of people who did not sign up for Facebook but are still being tracked.
Facebook Chief Operating Officer Sheryl Sandberg told NBC News on Thursday that Facebook users could have to pay to completely opt out of their data being used to target them with advertising. But Facebook doesn't asks them.
Zuckerberg is admitting something many suspected, and in doing so causes Facebook a serious problem. "That allows them to sort of see where you're going, and that's why ads can follow you around".
- Use the incognito mode or private mode in your browser as much as you can.
Facebook on Monday said: "Our goals are to understand Facebook's impact on upcoming elections - like Brazil, India, Mexico and the U.S. midterms - and to inform our future product and policy decisions". But for general web browsing use a separate browser (may Firefox) and in settings ensure that you have selected option to delete cookies after each browsing session.
In response, he initially said no, but reiterated Facebook's new investigation into third-party apps on the platform was seeking to discover if there had been any other cases of misuse. One is, you can go and work your way through all of Facebook's privacy settings and try to lock them down as much as possible.