CEO Mark Zuckerberg says the social media site is working to find better ways to raise red flags about questionable stories.
The announcement comes after critics claimed fake news on feeds played a role in the election.
Zuckerberg had originally said that was a "crazy idea".
But he said in a post that the company has been "working on this problem for a long time."
Zuckerberg said fact-checking organizations could be involved in the project as well.