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Photo: Drew Angerer/Getty Images

Mark Zuckerberg weighed in on what he called the "Cambridge Analytica situation" today in a Facebook post, saying there was a "a breach of trust between Facebook and the people who share their data with us and expect us to protect it. We need to fix that."

Why it matters: Facebook has been under extraordinary pressure from lawmakers, regulators and Wall Street to respond to the issue.

"We have a responsibility to protect your data, and if we can't then we don't deserve to serve you. I've been working to understand exactly what happened and how to make sure this doesn't happen again. The good news is that the most important actions to prevent this from happening again today we have already taken years ago. But we also made mistakes, there's more to do, and we need to step up and do it."
— Zuckerberg

Facebook also announced concrete actions in a separate post. It will:

  1. Notify users if it knows an app has been misusing data. "Moving forward, if we remove an app for misusing data, we will tell everyone who used it."
  2. Turn off access for unused apps. "If someone hasn’t used an app within the last three months, we will turn off the app’s access to their information."
  3. Limit the amount of data given to those that use Facebook Login, its authentication platform
  4. Go back and review pre-2014 apps that, like the one at the center of this scandal, had access to wide swaths of data including information not just by those using the apps, but also their friends. "We will conduct a full audit of any app with suspicious activity. If we find developers that misused personally identifiable information, we will ban them from our platform."

But there is a ton that wasn't said in either post, including his response to criticisms over how long Facebook took to disclose what it knew in this case as well as the many calls for new regulations and for company executives to testify.

Sandberg too: Also breaking her silence was Sheryl Sandberg, who shared Zuckerberg's post and adding "You deserve to have your information protected - and we'll keep working to make sure you feel safe on Facebook. Your trust is at the core of our service. We know that and we will work to earn it."

Initial reactions: Shares of Facebook inched up after the post, though many on Twitter noted how modest the specific changes being are. Meanwhile, Sen. Ed Markey replied to Zuckerberg, saying "You need to come to Congress and testify to this under oath."

But, but, but: What Zuckerberg didn't say in his note.

What's next: Zuckerberg is set to appear on CNN tonight.

Go deeper

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From Malcolm X to "Free Britney," new media shapes the justice system

Illustration: Shoshana Gordon/Axios

True crime documentaries, podcasts and social media campaigns are bringing new attention to real-world legal proceedings — and are often affecting the outcome.

Why it matters: New media platforms can instantly put a national spotlight on cases that have long been forgotten or buried under red tape.

Updated 11 hours ago - Health

The next big bottleneck in the global vaccination effort

Illustration: Rae Cook/Axios

The world still needs more coronavirus vaccines, but an additional bottleneck has emerged in many low-income countries: They need help getting shots in arms.

Why it matters: Increasing vaccination rates across the world is both a humanitarian necessity and the best way to prevent dangerous new variants from emerging, but it increasingly requires complex problem-solving.

Updated 11 hours ago - Health

COVID-19 Omicron variant cases identified in Europe, U.K.

People wearing masks walk in London on Nov. 25. Photo: Li Ying/Xinhua via Getty Images

Health officials in the United Kingdom, Italy and Germany announced on Saturday that they've detected the first known cases of the new COVID-19 Omicron variant.

Why it matters: The discoveries come as the world scrambles to respond to concerns over the new variant, discovered in South Africa earlier this week.