Facebook had a good election, but it can’t let up on vigilance

After an Election Day largely free of viral social media misinformation, and with little trace of the kind of Russian troll stampede that hit its platform in 2016, executives at Facebook may be tempted to take a victory lap.
That would be a mistake.
It’s true that Facebook and other social media companies have made strides toward cleaning up their services in the past two years. The relative calm we saw on social media Tuesday is evidence that, at least for one day, in one country, the forces of chaos on these services can be contained.
But more than anything, this year’s midterm election cycle has exposed just how fragile Facebook remains.