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The Young Wizards Discussion Forums have been in existence since 2001. Originally hosted on the Groupee (later Eve) community engine / discussion board platform, they were migrated to a vBulletin installation in 2007. Diane Duane has routinely participated in the forum message boards since their opening.
The boards are often quiet in between book releases, but remain active, and host sections and threads devoted to all the books, as well as discussion of YW meta and other associated subjects. They also host possibly one of the longest-running and largest discussion threads in history, the 1300-page Topic of Great Randomness.
The Forums’ front page can be found here.