Audition Update used to be a free crowdsourcing website that served as an outlet for actors to anonymously share important information.
The page was created by Tom Lapke in 2010 with the "sole purpose of helping actors get through their difficult day with a little more ease and information." It is now owned and run by Backstage and is hosted under the Backstage Community forum. 
Actors typically flood the site to update and receive information on the status of current auditions and callbacks. They can also write and read reviews on working at a specific theater, ask anonymous questions about the industry, give advice and insight, etc.
Forums include Audition Update, Callback Corner, The Working Actor, Child and Teen Actors, Child and Teen Models, Getting Started, and The Green Room.
Links mentioned in the podcast:
Backstage.com Community Forum Rules
Archived Gig&Tell Page
Archived Audition Update Page
Archived Callback Corner page
Further information on the Equity Membership Candidate Program
Actor Aesthetic Podcast on Equity Principal Auditions (EPAs)
Actor Aesthetic Podcast on Equity Chorus Calls (ECCs)
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