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President Trump and Russian President Putin at the 2018 G20 summit. Photo: Mikhail Svetlov/Getty Images

A new study found a correlation between retweets of known Russian troll accounts during the 2016 election and Donald Trump's poll numbers.

Why it matters: The study, conducted by a team headed at the University of Tennessee-Knoxville and published in the peer-reviewed University of Illinois-Chicago journal "First Monday," suggests that — despite protests to the contrary by Republicans and Trump allies — the Russian disinformation campaign was successful in influencing the 2016 election.

Caveat: Correlation does not always mean causation. If a Trump talking point encouraged a particularly viral Tweet, for example, it may have also encouraged a change in Trump's polling on its own.

  • It's also worth noting that the U.S. intelligence community has not conclusively weighed in on whether Russia's interference in 2016 had a tangible impact on the results of the election.

Details: The Tennessee-Knoxville study analyzed 770,005 tweets in English from known Russian troll accounts, as well as corresponding poll data from FiveThirtyEight's archive of multiple polling outlets.

  • Every 25,000 retweets of Russian accounts correlated to a 1% increase in Trump's poll numbers one week later.
  • Given the frequency of tweets from Russian accounts, 25,000 retweets would average around 10 retweets per tweet.
  • Retweets did not have a similar effect on Hillary Clinton's poll numbers.
  • The study also found that 91% of first retweeters of known Russian bots were non-Russian bots, "which suggests that propaganda spread into networks of real U.S. citizens."

Go deeper: U.S. is underestimating Putin's "grand strategy" for Russian dominance

Editor's note: The headline and first paragraph of this story have been updated to clarify that the study suggests a correlation between troll posts and Trump poll numbers.

Go deeper

6th victim dies following South Carolina shooting

Jack Logan, founder of Put Down the Guns Young People, places stuffed animals and flowers outside of Riverview Family Medicine and Urgent Care on Friday after the fatal shooting in Rock Hill, South Carolina, a day earlier. Photo: Sean Rayford/Getty Images

The only survivor of this week's mass shooting in South Carolina by former NFL player Phillip Adams has died of his injuries, authorities said Saturday.

Details: Robert Shook, 38, an air conditioning technician from Cherryville, North Carolina, died of gunshot wounds from Wednesday's shooting at a doctor's home in Rock Hill, S.C., which claimed the lives of five other victims.

3 hours ago - World

In photos: Egypt unveils 3,000-year-old "lost golden city"

A view on Saturday of the city, dubbed "The Rise of Aten," dating to the reign of Amenhotep III, uncovered near Luxor. Photo: Khaled Desouki/AFP via Getty Images

A top Egyptian archaeologist on Saturday outlined details of a newly rediscovered "lost golden city" near Luxor that dates back more than 3,000 years.

Why it matters: Zahi Hawass told NBC News the large ancient city, unveiled Thursday, tells archaeologists for the first time "about the life of the people during the Golden Age." Johns Hopkins University Egyptology professor Betsy Brian said in a statement it's "the second most important archeological discovery since the tomb of Tutankhamen."

1 dead as severe storms pummel the South

A tree that fell on a home carport damaged a vehicle during a storm in Central, Louisiana. No injuries were reported, according to Central Fire Department. Photo: Central Fire Department/Twitter

Strong storms lashed the South early Saturday, spawning at least one tornado and unleashing powerful winds and hail. And forecasters warned more severe weather was expected to hit parts of the region in the coming hours.

Details: Thousands of customers lost power in Florida, Mississippi, Arkansas, Texas and Louisiana, according to tracking site poweroutage.us. An F3 tornado that hit St Landry Parish, Louisiana, killed one person and wounded seven others.

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