Hello!

1. Existing instances: www.irthlingborough.net - despite the fact that I’ve been working on this for two years, you are amongst the first people to ever see a proper release. Before now, it would’ve been a challenging task for anyone else to install an instance. So I believe the only instance is that of my home town.
2. Users can only post locations within the proximity of their own habitat. The marker can only be placed inside of a circle determined by the admin. Additionally, you can create a registration challenge that relies on local knowledge for someone to sign up.
3. I’ve built in moderation tools to make banning, freezing accounts, promoting moderators, blocking email addresses etc. The idea is that communities will be small and manageable by small teams as a result.