So I havent been hanging around here for a while, just checking in each week or so. I was wondering if someone could explain the "single player tribes" that I saw mentioned in the update?

What is different about a single player tribe as apposed to a tribe with 5+ people? (apart from the obvious numbers)
Can a single player tribe be expanded to a multi player tribe?
Can a tribe be started with 3 or 4 people?
Is there still a minimum number of people required to place a totem, or can a single player place a totem(as it should be)?
If more than 1, whats the player number requirements for placing a totem now?

Cheers.