> Tribes fragment to smaller tribes, small tribes merge to large tribes etc.
When boundaries can change slowly enough we don't even notice. That's organic growth, that's ok.
> that aren't location-based, but thanks to telecommunications, global.
Thankfully I only have to close the browser tab to forget about someone Who is Wrong On The Internet. But I can't do that in meatspace.
1) It's also political differences in the same nation. Tribes fragment to smaller tribes, small tribes merge to large tribes etc.
2) There are divisions based on topics of interest, subcultures, etc. that aren't location-based, but thanks to telecommunications, global.