The social media giant is testing a feature where, if a user clicks to a piece on the Onion and goes back to Facebook, the related stories appearing beneath the link will be marked as satire.
"We are running a small test which shows the text ‘satire' in front of links to satirical articles in the related articles unit in News Feed," a Facebook official told the Independent.
"This is because we received feedback that people wanted a clearer way to distinguish satirical articles from others."
Facebook, which said it has been testing the feature with trial users for over a month, did not confirm whether the tag would be used on websites other than Onion.
The New Yorker's "Borowitz Report," another satirical site, is also often mistaken for real news.