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Some of the most interesting journalism experiments aren’t taking place on the websites of publications. Instead, they’re happening on Facebook and WhatsApp and Reddit and WeChat and even Nextdoor, which I didn’t realize was anything other than a place for Karens to complain about loitering.

Documented , an eight-year-old digital outlet that covers and serves immigrants in New York City and beyond, is behind many of these experiments—from producing a Chinese-language newsletter on WeChat to starting conversations on Nextdoor with Haitian Creole speakers in Flatbush, Brooklyn.…