Nextdoor

It could be so great, but it's so not. Posts by people wanting to sell their crap: oils, cookies, massages, etc. are not banned. Complaints to them about this were ignored.
And, as someone else indicated below, because they have local yokels running the show, I've often seen that people with opposing viewpoints to those LYs (a certain church, for example) are offensively bullied onsite -- over and over, without recourse.
People are better off starting a group on Facebook or Reddit.
This site is deceptive and poorly run.
The cat catcher post below breaks my heart. That should tell you everything you need to know about this garbage site.

While ND has good intention and operates on promoting local advertising, its guideline and lack of support leaves a huge room for community to turn against one another. For example, I've seen personal information posted online with one-sided stories, false claims, verbal attacks, intentional or unintentional to cause harms to others. ND will only interfere when the bullies complains without proper review to make sure the complain is valid and with merit. If you lived under "socialist-communist" society previously, you'll recognize that how ND operates: bully and the strong prevails, the weak, the kind and the considerate will be weeded out.

Nextdoor is very helpful to me in many ways. Some examples are 1) referrals for home services, restaurants, auto repair and barbers. 2) Neighborhood issues like crime, insects and stray cats. While most contributors are helpful, others have strange or hostile inputs. Sometimes the site administrator will improperly take sides with the perpetrator of an argument simply because that person submitted a complaint. I understand that it needs to be kept constructive but that can be quite tricky sometimes. I don't like improper advice to be disseminated so I try to diplomatically state the correct point of view.

This is a great tool for uniting neighbors in addressing matters ranging from crime in our neighborhood to finding lost pets, calling out predatory business practices (such as we're now experiencing with Comcast's violation of their "lifetime no increase in fee" guarantee), getting referrals for reputable tradesmen, getting gardening tips, or simply getting to know the rich diversity of "neighbors" around us. I greatly appreciate this platform.

Highly biased website. Additionally, nextdoor.com wants too much personal information and indiscriminately censors those with differing opinions than their own. They censored one of my posts to Vote YES on Proposition 6, citing "Political Content" All the while they were accepting advertising dollars from the Vote YES on 6 campaign. So they can advertise it, but its members cannot post about it. I was then accused of "Discrimination," which to me is a very serious accusation and made no sense. Anyone whose agenda differs from yours can complain and get you kicked off the site. They practice censorship in the worst way and definitely interfere with freedom of speech.

Great concept poorly executed. Works well for strictly information sharing (buy and sell things, event notices) but don't have opinions or ideas as you will be booted. I was put in time out until I agree to let idiots control my thoughts. No thanks. I will also now be on a campaign to get people to dump Nextdoor. By the way, my crime was calling someone who was bullying domestic violence victims "ignorant". It appears my disturbing experience is not unique.

This app was supposed to be able to connect neighbors within a city/town with helpful information as in restaurants, appliance repair, etc. It is nothing more than a terrible platform similar to Facebook. Full of bullies,and hate filled messages. No way to obtain assistance from "Leads" or area supervisors. Not worth the effort.