I live in a regional city. Let's say I setup a community of people that like to travel to the snow. And another community for those who enjoy day trips to nearby cities by bus etc. Then another community of, say home-schooled parents and kids, etc etc.

At some point, having trained all of these sub-communities to use Oxwall and to communicate through it, what if I wanted to bring all of the communities together into one big regional city community? How would I go about that?

1. Setup separate Oxwall's for each community, then somehow bring them all into one Oxwall community?

2. Setup a regional city Oxwall from the start, but setup groups, keeping everyone in their own silos. Then at a later point, remove the privacy of the Groups, so they can all see each other OR, setup a Group that all the other groups' members can see and access, so that they can keep their own groups conversations private/separate to the regional city wide forums/blogs etc?

3. Another way?

Reason I'm interested is that the only community wide conversations are either controlled by the city council or the main local newspaper (which is in bed with the city council), or the local community radio station that few hear.

I thought it would be easier to promote and build smaller communities among interest groups, then bring it all together to discuss city wide issues.