Don’t believe everything you read on Facebook.

The Silicon Valley tech firm has started rolling out a new warning label for news stories that are “disputed” by a third-party fact checker, such as Snopes and PolitiFact.

These fact-checking organizations are part of Poynter’s International Fact-Checking Network.

Facebook users can flag a fake news story by clicking on a gray downward arrow button on the right side of an article.

The spread of misinformation on social media sites became a growing concern after Donald Trump won the presidential election.

(Next page: Mark Zuckerberg’s take on fighting fake news)