Nextdoor Holdings, Inc. is an American company that operates a hyperlocal social networking service for neighborhoods. The company was founded in 2008 and is based in San Francisco, California. Nextdoor launched in the United States in October 2011. It is available in eleven countries as of May 2023. In 2024, the company claimed to have 88 million "neighbors" as members. Users of Nextdoor are required to submit their legal names and addresses to the website, and addresses are confirmed using postcards with verification codes. Wikipedia