If you want to find a group that has serious discussions about the Phoenix art scene try Arizona Artists.
Best Facebook Page About the Phoenix Art Scene Phoenix 2012 - The Phoenix Remodernists
Most of the Facebook pages devoted to the Phoenix arts scene are given over to promotions of upcoming events and a whole ton of inner-circle schmoozing. But the Phoenix Remodernists page is somehow different. Interesting discussion actually takes place here, among a varied crowd of artists, art fans, and collectors. Sure, there are the usual plugs for an exhibit or two, but there's also a lot of insight into what the art crowd is actually up to when it's not plowing through another First Friday. One can find more than just gossip and dissension among the daily posts on this page, a sort of clearinghouse and message board for creative types who want input on what they're working on and how they're feeling about it. Check them out.