NextDoor reinvented the idea of a neighborhood listserv, and turned what used to be mass emailing into an online neighborhood community. To join, you simply confirm your address via credit card, phone number, or a postcard sent to your house. Once you have access to your neighborhood community, members share all sorts of information, such as garages sales, lost and found items, break-ins, or information about local elections.
It’s an empowering concept that has taken off - as of June 2016, over 100,000 neighborhoods in the United States had joined NextDoor. The idea of real places informing online spaces worked to NextDoor’s advantage.