After this week’s mass shooting in Las Vegas, both Google and Facebook promoted false news stories about the massacre. Both platforms took down the stories, but not before they were widely shared. Today on Marketplace Tech, we look at how fake news is promoted and why algorithms might not be enough to stop it.

After this week’s mass shooting in Las Vegas, both Google and Facebook promoted false news stories about the massacre. Both platforms took down the stories, but not before they were widely shared. Today on Marketplace Tech, we look at how fake news is promoted and why algorithms might not be enough to stop it.