News Use Across Social Media Platforms 2017 | Pew Research Center

On a related note, see The Fake Americans Russia Created to Influence the Election (NYT)

"As of August 2017, two-thirds (67%) of Americans report that they get at least some of their news on social media – with two-in-ten doing so often, according to a new survey from Pew Research Center. This is a modest increase since early 2016, when (during the height of the presidential primaries) 62% of U.S. adults reported getting news from social media. While a small increase overall, this growth is driven by more substantial increases among Americans who are older, less educated, and nonwhite. This study is based on a survey conducted August 8-21, 2017, with 4,971 U.S. adults who are members of Pew Research Center’s nationally representative American Trends Panel.

For the first time in the Center’s surveys, more than half (55%) of Americans ages 50 or older report getting news on social media sites. That is 10 percentage points higher than the 45% who said so in 2016. Those under 50, meanwhile, remain more likely than their elders to get news from these sites (78% do, unchanged from 2016)."

News Use Across Social Media Platforms 2017 | Pew Research Center