Read this article in the New York Times our friends over at Nextdoor.
Nextdoor is a community platforms that hosts 53,000 micro-communities. It's now valued at $1.1bn. Journalists often believe this is because Nextdoor verifies every member is a member of the local community they want to join.
This isn't as important as you think. The genius of Nextdoor is to side-step Patch's 1000 employee, content-driven route in favour of member-interactions, a far superior platform, and the best on-boarding process for network creators I've seen.
The onboarding process combines a huge degree of member autonomy (you can set your neighborhood's boundaries) with responsibility (you have to get 10 members in the first 21 days) and nudges each creator in the right direction of a successful community.
Spend a few minutes looking at Sarah Leary's (Nextdoor's co-founder) slides below. Begin from 15 onwards. Try to ascertain the psychology between making it hard but rewarding to create a network.