The two met in private on November 19 at a world leaders forum in Lima, Peru, according to people briefed on the exchange.
Mr. Obama told Zuckerberg that if Facebook did not do more to address the threat, the problem would only continue to get worse in elections to come. Zuckerberg, in turn, assured Mr. Obama that he was aware of the problem, but that such messages weren't widespread on Facebook and there was no easy solution.
Since then, Facebook has increasingly put in place solutions to German election, for example., which seem to have had some effect. The fake news that plagued the 2016 U.S. election and the 2017 U.K. election did not seem to play as significant a role in Sunday's
But Facebook has still been slow in acknowledging its role in allowing fake news to impact the outcome of last year's U.S. presidential race. Only this month did the social network disclose that it sold $100,000 worth of ads to during the election. Last week, the company said it would hand over 3,000 Russia-linked ads to the Senate and House intelligence committees.
Zuckerberg promised to keep working on solutions, but emphasized Facebook could not prevent all wrongdoing on the social network. "There will always be bad people in the world, and we can't prevent all governments from all interference," Zuckerberg said. "But we can make it harder. We can make it a lot harder."
Representatives for Facebook and Mr. Obama didn't immediately respond to request for comment.
This article originally appeared on CNET.