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Nextdoor is amazing for that! Every time a car backfires there are multiple posts about "Gunshots in the area!?"

Helicopter flying overhead? be sure to follow the multiple "Police choppers looking for a perp in our neighborhood!" posts.

People revel in fearmongering :(

You lead a boring, event-free life and suddenly everything out of the ordinary becomes an alarming anomaly.

And then wonder why the society is so trigger-happy?

The best summary of next door is "twitter for old people".