I don't know about KaZaA but I remember it was very popular for a time, so it might have done some things right? What was its fate? Was it censored to death?
And I disagree very much that IRC is "semi-decentralized". IRC is completely centralized, it is just chat rooms on a server. You have to register on each server and each server has full control over its rooms and users.
And I disagree very much that IRC is "semi-decentralized". IRC is completely centralized, it is just chat rooms on a server. You have to register on each server and each server has full control over its rooms and users.