This article triggers one of my current pet peeves. It treats privacy and anonymity as more or less the same thing. Anonymity is a sort of privacy related to id

This article triggers one of my current pet peeves. It treats privacy and anonymity as more or less the same thing. Anonymity is a sort of privacy related to identity, but it is not required that you are anonymous to have privacy. Everyone can know that I am sending encrypted messages to other people but those messages are still private. Anonymity should be discussed as a special case. Having said that, XMPP can be quite anonymous in practice. There are public XMPP servers running on hidden services. XMPP servers do not insist that you give them any personal information at all. In particular they normally do not require a phone number.