There is a "Geocaching -- Arizona" group on Facebook and it's an open group. I'm a member and I know others on this listserv are too.
Melinda of Team Caballero
We could have a AZgeocaching “Group” Facebook page.. here’s an example of one: http://www.facebook.com/#!/groups/236575076365962/
It’s a great way to keep up everyone in the subject matter. They have a common area where group members can edit files and of course write on the wall, etc. Creating unofficial caching adventures would be a snap using this.
Az-Geocaching mailing list firstname.lastname@example.org
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Arizona's Geocaching Resource