2021 update: Nextdoor convinced Khosla Ventures that it's worth $4 billion, and in preparation for going public Nextdoor has expanded the default reach of every post. As a result, the feed is unmanageable noise. So if you come on Nextdoor looking for the Police Department's comments on an issue, you first have to scroll past dozens of posts from people three towns away asking if anyone heard a loud noise down the street at 3:00 a.m., posting pictures of their dogs, and observing that it is raining. It's garbage, and the unpaid Leads Nextdoor has relied on to moderate content are disengaging from the platform.
From 2018:
My local Nextdoor site is devolving into nothing but a collection of knick knacks for sale, because any thread dealing with anything more interesting than dentist recommendations is flagged for removal. A few bullies want to determine what everyone else in the neighborhood talks about, and they are doing so with the aid of Nextdoor management by complaining that opposing views are not "neighborly." What a waste of millions in investors' money.