Which famous bookstore chain pioneered the 'Reader's Circle' loyalty program that rewards customers not just for purchases, but also for posting book reviews and attending author events?

In the competitive world of bookselling, loyalty programs have become sophisticated tools to retain customers and encourage reading habits. Major bookstore chains and independent shops alike have developed unique ways to reward their most dedicated readers. This trivia question tests your knowledge about one of the most innovative loyalty programs in the literary retail space that revolutionized how readers engage with bookstores.

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Barnes & Noble with their 'B&N Membership'
Waterstones with their 'Plus Card' system
Books-A-Million with their 'Millionaire's Club'
Powell's Books with their 'Indiespensable' program