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Photo: Sven Hoppe/dpa via Getty Images

Mark Zuckerberg, speaking at a fireside chat at the Munich Security Conference, said that since 2016, Facebook has "played a role in helping to defend the integrity of" more than 200 elections around the world.

Why it matters: On top of growing revenue and the number of users on Facebook, Zuckerberg also has to ensure that the platform is not blamed for negatively influencing elections and does not buckle on freedom of speech.

What he's saying: Zuckerberg said the successful techniques have included "developing AI systems that can identify fake accounts and networks of accounts."

  • "In the last couple of weeks, we took down one that was coming out of Russia [targeting] Ukraine, and one coming out of Iran that was targeting the U.S."
  • Zuckerberg said the majority of the more than 1 million fake accounts Facebook takes down each day aren't connected to state actors interfering with elections. They're spammers.
  • "One of the things that we are tracking that we have been quite worried about is that increasingly, election interference ... is ... also domestic. You have ... local actors also trying to employ some of the same tactics. ... We have also seen these actors get more sophisticated at trying to hide their tracks."

Zuckerberg said a big Facebook transformation in the last few years has been "from being more reactive about addressing content-type issues to being more proactive":

  • "I started the company in my dorm room. Back then, we could not have 35,000 people doing content and security review. The AI. 16 years ago, did not exist ... to identify this type of harmful stuff."

"Hate speech is a particularly challenging one," he continued. "We have to be able to train AI systems to detect ... nuances. Is someone posting a video of a racist attack because they are condemning it ... or are they encouraging other people."

  • "Multiply ... that subtlety, linguistically, by 150 languages around the world where we operate."

Go deeper: Facebook executive argues digital ads got Trump elected

Go deeper

Updated 3 hours ago - Sports

Swimmer Chase Kalisz first American to win Olympics gold medal

Chase Kalisz of Team United States celebrates after winning the Men's 400m Individual Medley Final on day two of the Tokyo 2020 Olympic Games at Tokyo Aquatics Centre in Tokyo, Japan. Photo: Al Bello/Getty Images

Swimmer Chase Kalisz became on Sunday the first Team USA Olympian to win gold at the Tokyo Games.

The big picture: The Rio 2016 silver medalist's winning time in the men's 400 meters Individual Medley Final was 4 minutes 9.42 seconds. His teammate Jay Litherland took silver .86 seconds later.

California's largest wildfire razes homes as 88 huge blazes burn in U.S.

Firefighters on the scene as dozens of homes burn during the Dixie Fire in the Indian Falls neighborhood of unincorporated Plumas County, California, on July 24. Photo: Josh Edelson/AFP via Getty Images

Flames from California's biggest wildfire were engulfing homes in the state's north overnight — one of 88 large blazes raging in the U.S.

Driving the news: The Dixie Fire, which erupted July 14 near the origin of the deadly 2018 Camp Fire in Butte County, was tearing through the community of Indian Falls in the neighboring Plumas County, per AP.

Golfer Bryson DeChambeau will miss Olympics after testing positive for COVID

Bryson DeChambeau of the United States on the 18th tee during Day Two of the 149th Open at Royal St George’s Golf Club on July 16 in Sandwich, England. Photo: Andrew Redington/Getty Images

Bryson DeChambeau has tested positive for COVID-19 and will miss the Tokyo Olympic Games, USA Golf announced late Saturday.

What he's saying: "I am deeply disappointed not to be able to compete in the Olympics for Team USA," DeChambeau said in a statement.