Nextdoor raises $123M at a $2.1B valuation

I hope Nextdoor puts in some measures towards not becoming facebook groups 2.0.

Almost all the conversations I've seen in there have been hugely controversial - only now, there is no worry of the other person flipping out and embarrassing you and everyone is google-intelligent. You see a ton of people shitting on others houses etc. I don't know how to solve it :\

How does nextdoor make money?