In September, a man carrying a machete and a crowbar walked into the Chapel of the Holy Hill in Sedona, Arizona, and started destroying things. He turned out to be a follower of QAnon, the far-right conspiracy group behind the 2016 “Pizzagate” shooting, as The Daily Beast later reported. His vandalism rampage was captured in photos and video by tourists; hours after the incident, the alleged attacker was arrested by police.
How did the cops close in so quickly? Sedona police chief Charles Husted credits Nextdoor, the neighbor-to-neighbor social-media platform. Within 20 minutes of the incident, Husted posted an “urgent alert” with a photo and description of the suspect on Sedona’s Nextdoor account. That post swiftly circulated through the city as neighbors shared it, reposted it on other social media platforms, and sent it to their friends. Soon, a shopkeeper who’d been sent the post by her mom realized she’d seen the man in question—and called 911. “It was perfect,” Husted said.