The downside to surveilling your neighbors

In late August, a resident of Mobile, Ala., posted a video on Nextdoor, a social media app that advertises itself as a place for neighbors to connect. The clip, from a home security camera, showed a man—”Race- black Age- teenager or early 20s”—taking a leaf blower from the poster’s property. “Let’s set up a sting and I will have my AK-47 ready for the next one,” a neighbor responded. In the days before and after that post, Mobile residents discussed other suspicious activity on Nextdoor and similar apps. Some posters used barely coded racist language, others mentioned obtaining pistol permits…

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