A tweet about a Pentagon explosion was fake. It still went viral.

“This isn’t an AI issue, per se,” said Renee DiResta, research manager at Stanford Internet Observatory and an expert on how misinformation circulates. “Anyone with Photoshop experience could have made that image — ironically, could probably have done it better. But it’s a look at how signals that help people decide whether information about breaking news is trustworthy on Twitter have been rendered useless, just as the capacity to create high-resolution unreality has been made available to everyone.” “Our number of followers pales in comparison to some of the most...