The most important takeaway from Quinn's research, however, was that engaging with toxic content only made it worse. "When you get attacked, the instinct is to push back, call it out, say, 'This isn't true,'" Quinn says. "But the more engagement something gets, the more the platforms boost it. The algorithm reads that as, 'Oh, this is popular; people want more of it.'"

The solution, she concluded, was to pressure platforms to enforce their rules, both by removing content or accounts that spread disinformation and by more aggressively policing it in the first place. "The platforms have policies against certain types of malign behavior, but they haven't been enforcing them," she says.

Quinn's research gave ammunition to advocates pushing social media platforms to take a harder line. In November 2019, Mark Zuckerberg invited nine civil rights leaders to dinner at his home, where they warned him about the danger of the election-related falsehoods that were already spreading unchecked. "It took pushing, urging, conversations, brainstorming, all of that to get to a place where we ended up with more rigorous rules and enforcement," says Vanita Gupta, president and CEO of the Leadership Conference on Civil and Human Rights, who attended the dinner and also met with Twitter CEO Jack Dorsey and others. (Gupta has been nominated for Associate Attorney General by President Biden.) "It was a struggle, but we got to the point where they understood the problem. Was it enough? Probably not. Was it later than we wanted? Yes. But it was really important, given the level of official disinformation, that they had those rules in place and were tagging things and taking them down."

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