Nextdoor is fraught with problems. We had one woman using it in her 80s who, due to eyesight, typed in all caps. Virtually no one on Nextdoor would accept her handicap and accused her of shouting. She didn't understand browser or display zoom to use lower case. Despite that she was active for awhile and contributed. Her contributions were worthwhile and insightful. Eventually she was stalked online by someone in the neighborhood who took the time, at 2 AM, to sequentially flag all of her posts. It was very upsetting and stressful for her. Nextdoor offered zero support in identifying the stalker and deactivating their account. All of this information was clearly in their log files. This was escalated all the way to the CEO who did nothing. The woman dropped off Nextdoor. About 6 months later, after all the damage was done, Nextdoor identified the perp who had already moved out of the neighborhood.
Nextdoor is also increasingly political, and following a national trend of social media, highly left-leaning. If you're a member of Antifa you'll fit right in. I've seen some very hostile posts by know-it-all bullies attacking simple benign suggestions or comments. I've also begun to see a pattern of progressive social justice warriors now using Nextdoor as a platform. Moderation is non-existent. The email notifications you will receive - bombarded with is more descriptive - will contain the rants, ravings and unwanted opinion of everyone unemployed, mentally-ill or home-bound and bored person in your neighborhood.
My advice to everyone is to consider Nextdoor just as toxic as Facebook, Twitter and most television. Very little has been accomplished in improving our neighborhood using Nextdoor. Get a dog instead.