“We didn’t take a broad enough view of our responsibility, and that was a big mistake,” Mr. Zuckerberg said in comments published by the House Committee on Energy and Commerce. “It was my mistake, and I’m sorry. I started Facebook, I run it, and I’m responsible for what happens here.”

Facebook is entering a week of intense scrutiny in Washington, with Mr. Zuckerberg scheduled to testify before congressional committeeson Tuesday and Wednesday. The company is confronting a surge in criticism over how it handled the private data of as many as 87 million users that was harvested by Cambridge Analytica, a political consulting firm tied to President Trump’s 2016 campaign.

Mr. Zuckerberg, in his prepared remarks, addresses the scandal, saying that Facebook must do more to protect its users’ personal information. The company, he says, will block app developers from gaining access to the data of users who have been inactive for three months; restrict the ability of users to inadvertently share information about others in their networks; and adopt stricter permissions guidelines and search features.

In a separate post on Facebook on Monday, he also said that Facebook would form an independent commission of academic researchers to study social media’s impact on elections.

His appearances on Capitol Hill starting Tuesday will be one of the Facebook mogul’s most public challenges to date. Here’s what to expect, according to Kevin Roose, Cecilia Kang and Sheera Frenkel of the NYT:

Democrats are expected to grill Mr. Zuckerberg about the privacy scandals, and how the social network is guarding against possible interference in this fall’s midterm elections. Republicans are expected to be more reticent about privacy regulations, and may use the hearings to raise suspicions of political bias on the social network.

Mr. Zuckerberg has prepared for his testimony with a crash course in charm and humility. The goal is to look humble and forthright — and definitely not like the “S.N.L.” parody of him. (“S.N.L.”-Zuckerberg on user data: “It’s mine — you gave it to me, no backsies.”)

• Facebook has suspended another data analytics company for misleading users. It will start notifying users today about what data was shared with Cambridge Analytica. (Some affected users contacted by the NYT were angry.) The company will require political ad buyers to verify their identities and locations. What Facebook’s tightening of its privacy controls to a new European standard means for you. And Facebook’s viral stars want a bigger cut of ad revenue.

• Tim Cook of Apple took a shot at Facebook’s business model in an MSNBC/Recode interview: “We’re not going to traffic in your personal life. I think it’s an invasion of privacy.”