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What role did Facebook-fueled fake news play during the election? We don’t yet have all the answers, but one BuzzFeed analysis found that largely pro-Trump fake stories received more “engagements”—shares, reactions, and comments—than the top election stories from 19 major news outlets combined. That’s not trivial. According to the Pew Research Center, most Americans who turn to social media for their news are only getting it from one platform—with Facebook being the most common.

Recent outlandish headlines included “I Was Paid $3500 to Protest Trump’s Rally” and “FBI Agent Suspected in Hillary’s Email Leaks Found Dead in Apparent Murder-Suicide.” The definition of “fake news” is broad, and not all these stories are invented from whole cloth, argues David Mikkelson, the founder of debunking website Snopes: Some are better described as “highly distorted clickbait,” containing nuggets of fact repackaged into extraordinary falsehoods by partisans for political effect.

Under pressure to combat misinformation, CEO Mark Zuckerberg promised action in a Facebook post early Saturday morning: “I want you to know that we have always taken this seriously, we understand how important the issue is for our community and we are committed to getting this right.”

So how exactly did fake news stories rise to such outsize prominence on Facebook? We’ve laid out a few key moments: