Users in 22,500 neighborhoods (one-in-seven in the country) are using Nextdoor, “The Facebook of your neighborhood”, to cultivate leads, according to this article from Inman.com. Nextdoor’s customer base has increased by 400 percent over the last 12 months, according to CEO and founder, Nirav Tolia. It is also versatile. City government and law enforcement officials can benefit from it as well as neighborhood residents, homebuyers and real estate agents. At…