The neighborhood social media platform Nextdoor is planning to go public at a valuation of around $4.3 billion. The company says it saw astronomical growth in active users this past year. Its shares will trade under the ticker symbol “KIND” because part of the company’s mission, it says, is to cultivate kindness. At the same time, the platform has struggled to deal with hate speech and the spread of misinformation. Nextdoor says it is willing to accept a decline in user engagement if that means the platform has less racist speech. Marketplace’s Kimberly Adams speaks to Susan McGregor, a scholar with the Data Science Institute at Columbia University. McGregor says that even though people may know one another on Nextdoor, it doesn’t necessarily make them nicer.