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When Facebook CEO Mark Zuckerberg was grilled on Capitol Hill last month, Sen. Lindsey Graham asked him whether his company faces any real competition: "If I buy a Ford, and it doesn't work well, and I don't like it, I can buy a Chevy. If I'm upset with Facebook, what's the equivalent product that I can go sign up for?"

Mark Zuckerberg left Capitol Hill last week with his primary mission complete.

After Facebook CEO Mark Zuckerberg testified before Congress Tuesday and Wednesday, Facebook users — among many — are still wondering if online privacy still exists.

At the hearing before the House Energy and Commerce Committee Wednesday, Rep. Ben Luján (D-N.M.) asked Zuckerberg if Facebook had detailed profiles on even those who had never signed up for the social networking site.

He replied, "In general, we collect data of people who have not signed up for Facebook for security purposes."

Updated at 3:08 p.m. ET

After five hours of testimony before a joint session of two Senate committees on Tuesday, Facebook CEO Mark Zuckerberg returned to the Capitol for a second straight day of grilling — this time before the House.

Updated at 7:35 p.m. ET

Mark Zuckerberg faced dozens of senators — and the American television audience — to take "hard questions" on how Facebook has handled user data and faced efforts to subvert democracy.

"We didn't take a broad enough view of our responsibility, and that was a big mistake. It was my mistake, and I'm sorry," the co-founder and CEO of Facebook, uncharacteristically wearing a suit, said in his opening remarks. "I started Facebook, I run it, and I'm responsible for what happens here."

Facebook CEO Mark Zuckerberg will face Congress in two separate hearings this week, as his company grapples with intense scrutiny over privacy and security on the social media site. It will be Zuckerberg's first appearance on Capitol Hill.

On Tuesday afternoon, more than 40 senators will crowd into a hearing room, where members of the Senate judiciary and commerce committees will have four minutes each to question Zuckerberg. A similar scene will play out Wednesday, when he is set to appear before members of House Energy and Commerce Committee.

As the Facebook scandal over Cambridge Analytica's misuse of the personal data of millions of users continues to unfold, Facebook is suspending another data analytics firm over similar allegations.

According to reporting by CNBC, Cubeyou collected data from Facebook users through personality quizzes "for non-profit academic research" developed with Cambridge University — then sold the data to advertisers.

Updated at 8:30 p.m. ET

Facebook CEO Mark Zuckerberg will testify on Capitol Hill on April 10 and 11 before the a joint hearing of the Senate Judiciary and Commerce Committees, followed by one before the House Energy and Commerce Committee, to answer questions about how the company protects its users' data.

Over the past few months, Charlie Manning has gotten complaints about Facebook advertisements, requests for assistance in recovering lost passwords and demands to speak to Mark Zuckerberg. She doesn't work for Facebook, though: Manning is a senior 911 dispatcher for the Menlo Park, Calif., police department. She regularly gets 911 calls from Facebook users around the world.

Updated at 7:50 p.m. ET

The Federal Trade Commission confirmed Monday that it is investigating the possible misuse of the personal information of as many as 50 million Facebook users. The probe comes after the social network admitted it suspended a firm that worked on behalf of the Trump campaign to use personal information gathered on Facebook to target potential Trump supporters.

Top executives at Cambridge Analytica, the U.K.-based firm embroiled in a controversy over the mining of Facebook user data, have been secretly recorded describing the stealthy methods they used to help get Donald Trump elected.

Facebook CEO Mark Zuckerberg announced Thursday that the social media giant would begin emphasizing more "meaningful" content on users' feeds — giving greater weight to posts from friends and family and less to businesses, brands and media.

In a long Facebook post of his own, Zuckerberg stressed that the social media platform — which has more than 2 billion active users worldwide — was created "to help people stay connected and bring us closer together with the people that matter to us."

Shortly before Election Day last year, some helpful-looking posts began popping up on Twitter: No need to stand in line or even leave home, they said — just vote by text!

The messages, some of which appeared to come from Hillary Clinton's campaign, had versions in Spanish, with gay pride flags and other permutations. They were also 100 percent false.

Where did they come from?

Updated at 2:17 p.m. ET, Oct. 3

Facebook said on Monday it has given Congress thousands of ads linked with Russian influence operations in the United States and is tightening its policies to make such interference more difficult.

"Many [of the ads] appear to amplify racial and social divisions," it said.

The social media giant confirmed that it discovered the ad sales earlier this year and gave copies to Justice Department special counsel Robert Mueller, who is investigating Russian interference in the 2016 election.

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