News Feed relies on various signals, including user feedback, to determine which posts may contain inaccurate information and to then reduce their distribution.
While it's unclear what concrete steps Facebook plans to take in addition to this, Zuckerberg said they'll have to walk a delicate path moving forward to ensure they're not stifling differences of opinion.
"I am confident we can find ways for our community to tell us what content is most meaningful, but I believe we must be extremely cautious about becoming arbiters of truth ourselves," he wrote.