a server controlled by/for an individual
doesn't have to be a physical Home Server/DesktopWebServer machine, could be virtual/Hosted Server
for your Universal Inbox/Universal Outbox hosting?
talk P2P with other people's servers? a challenge because of NAT
but People Don't Want To Run Their Own Servers
Jul'2012: Les Orchard breaks the category down into "aerostats, base stations, and the cloud" to support an Open Social Networking Model.
Sovereign is a set of Ansible playbooks that you can use to build and maintain your own personal cloud (I know I know). It’s based entirely on open source software, so you’re in control. (Alex Payne)