Nextdoor is terrible. I get push notified of every lost cat or dog. Or whenever the local grocery store is out of cabbage. Or "suspicious people" walking around. I can't find a way to get any value out of it.
The bane of Nextdoor. Every person within 100 yards is suspicious, especially if they have "Hair color: african" (I kid you not, this one is from my neighborhood Nextdoor).