Membership to the Progressive U Alumni Association is by invitation only. To receive an invitation to join the Association, you must be recommended by a current member and/or be in the top 1% as far as number of posts and comments. Association members must also have a clean recent record on the site, which mean no one who's spammed other users, violated the Terms of Service, or had valid complaints made about them during the past contest.
Each member of the Alumni Association has a badge denoting this honor. They are also able to form new groups on Progressive U, and help the faculty test out new features for the site.
