...
People can request access to the mailing list. To be accepted for membership, two existing list members (at least one of which from a different organisation than that of the applicant) must express support for the inclusion.
XMPP chat room
Members of the FOG mailing list may also join the FOG XMPP MUC (multi-user chat), which is operated under the same rules as the mailing list (see above). To get your JabberID authorized for the XMPP MUC send it to ownerfog-fog request at lists.refeds.org, from the email address you're subscribed with to the FOG mailing list.
...