@reibeatall basically it's just that you can be on any instance at any moment. that's why thare is a local and a global ''chat''. We could open our own instance that anyone could join, but they still could communicate with other instances. Also it's means the same ''username'' could be used multipletime. like
[email protected] or
[email protected] etc...
for the UI, I use chrome or Tusky on android and it work so far pretty well..