I am careful what I say on Nextdoor....but I think in my area it’s useful for crime reporting. Neighbors notify everyone about suspicious cars, activity, etc and I’ve noticed that some are shocked at increasing and bold crime and don’t object when some brave person says elections have consequences.
Besides that I sold a chair for $850 on Nextdoor - neither Craig’s list nor offer up worked.
I figured they'd freak out more to see someone wearing a MAGA hat.
I find Nextdoor useful for monitoring local criminal activity. Posters bitch and moan in great detail about incidents which never get reported elsewhere. It is useful to see the patterns of the scams and other exploits.
The local police monitor Nextdoor postings for the same reason. Once in a while they make a posting bragging about some arrest that presumably will reassure the public. They use Twitter("X") for that purpose too.
I never post in Nextdoor. There is no purpose served by doing that.
For some unknown reason, I was appointed as a Nextdoor moderator. It seems to have been a random pick. I routinely vote to drop any posts with personal insults and vote to pass all other posts. I am usually outvoted on the latter items, as most of the other moderators are flaming leftists. I do not try to engage them in any way.