This is similar to Hubzilla but with a reduced range of features concentrating exclusively upon social networking with the latest version of the Zot protocol. Nomadic identity is supported, so to can export your channels and import them on other servers if necessary, without losing followers.
Zap also has sophisticated privacy controls which enable you to decide exactly how you wish to interact with other users and what information of yours they can view.
Forward port 80 and 443 from your internet router
The first account you register will be the administrator user, and from there you can go to the admin settings and disable new registrations if needed.
To find other users to follow select "directory" from the drop down menu at the top right of the screen and set "this site only" to "no".
There is an Android app available called Nomad.