Depends. Just like SMTP, XMPP can be centralized (if everyone's on the same server, say gmail.com), as much as it can be distributed (if everyone's on his own s

Depends. Just like SMTP, XMPP can be centralized (if everyone's on the same server, say gmail.com), as much as it can be distributed (if everyone's on his own server) and anywhere in between. Tox can only be distributed.