This is a great how-to from Darius Kazemi!
The main reason to run a small social network site is that you can create an online environment tailored to the needs of your community in a way that a big corporation like Facebook or Twitter never could. Yes, you can always start a Facebook Group for your community and moderate that how you like, but only within certain bounds set by Facebook. If you (or your community) run the whole site, then you are ultimately the boss of what goes on. It is harder work than letting Facebook or Twitter or Slack or Basecamp or whoever else take care of everything, but I believe it’s worth it.
There’s a lot of good advice for community management and the whole thing is a lesson in writing excellent documentation.