An author posting original content is always a single point of failure. That's a problem based in the physical world and has nothing to do with the computer-bas

An author posting original content is always a single point of failure. That's a problem based in the physical world and has nothing to do with the computer-based system by which they distribute their content. If revx email host gets shutdown, he can find a new one easy peasy. revx can just update his domain's DNS records to point them to a new server. The federated nature of email prevents any individual email host from being a single point of failure, which I would believe is the point when comparing publishing via email to publishing content via a social network platform.