This page contains what the Org <8.0 manual said about the XOXO export.
You can use the XOXO export by cloning Org's git repository and checking out release_7.9.4
Org mode contains an exporter that produces XOXO-style output.
Currently, this exporter only handles the general outline structure and does not interpret any additional Org mode features.
|C-c C-e x||org-export-as-xoxo||Export as an XOXO file (myfile.org -> myfile.html)|
|C-c C-e v x||Export only the visible part of the document.|