How Nextdoor implemented new features to reduce racist posts by 75 percent

“Erasing racism through technology alone is impossible,” Kashmir Hill writes, but neighborhood social network Nextdoor found that a few changes to its interface reduced the number of racist posts significantly. Those changes, which were rolled out to all of its users last week, include requiring users whose posts in the “crime and safety” section mention race to submit additional information — such as more information about what the person they’re posting about looked like or what they were wearing. Plus, Nextdoor added “racial profiling” as a category when users mark a conversation as inappropriate.