Researchers looked at Facebook posts leading up to the 2016 presidential election and after, checking them for popular news domains known for spreading disinformation.
The study did find, however, that the practice of sharing so-called fake news was fairly rare in general.
A recently published study found that Facebook users over 65 years old were far more likely than other adults to share disinformation on social media.
The researchers defined fake news as "knowingly false or misleading content created largely for the purpose of generating ad revenue."
Of those who said they used Facebook, only 49% agreed to share any profile data.
Eleven percent of users older than 65 shared an article consistent with the study's definition of fake news.
The study drew its list of "fake news domains" from a list assembled by the journalist Craig Silverman of BuzzFeed News. »