Mark Zuckerberg, the billionaire founder and chief executive of Facebook, faced a much tougher crowd on the House side of Capitol Hill in his second day of congressional testimony.

Over the two days, there were nearly 10 hours of hearings, during which almost 100 lawmakers grilled Mr. Zuckerberg.

While Tuesday’s Senate hearing contained tough questions, the lawmakers were generally deferential to the executive. That was less the case in the House, where lawmakers repeatedly interrupted Mr. Zuckerberg and chided him for not answering questions to their satisfaction.

Lawmakers on both side of the aisle on Wednesday pushed Mr. Zuckerberg on his company’s handling of user data. They were particularly focused on the platform’s privacy settings, which put the onus on users to protect their privacy.

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Zuckerberg was asked to agree to privacy legislation that requires permission for data collection. Mr. Zuckerberg demurred and did not express support for any specific legislative proposal.

Representative Frank Pallone Jr., a New Jersey Democrat, pressed Mr. Zuckerberg on whether Facebook would agree or refuse to change Facebook’s default settings to minimize collection and use of users’ data.

“This is a complex issue that deserves more than a one word answer,” Mr. Zuckerberg answered.

“That’s disappointing to me,” Mr. Pallone responded.

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The concern was echoed by Representative Bobby L. Rush, a Democrat of Illinois, who pointed a finger at Mr. Zuckerberg and asked: “Why is the onus on the user to opt in to privacy and security settings?”

But Mr. Zuckerberg also did not dismiss a proposal from Representative Raul Ruiz, a Democrat from California, to create a digital consumer protection agency that would subject Facebook and its peers to some degree of government involvement.

Mr. Zuckerberg called the idea one “that deserves a lot of consideration” but said that the “details on this really matter.”