No price is too great to keep the streets safe is a sentiment shared by parents, home owners, and, it seems, investors.

Nextdoor, a private social network for neighborhoods, has secured $21.6 million in new funding from Greylock Partners. This round closely follows the $18.6 million Nextdoor raised in 2012, meaning it has raised over $40 million to protect homes in less time than it takes to build one.