Oprah is expanding her digital portfolio through her ongoing partnership with tech giant Apple to launch her new podcast, “Oprah’s Book Club,” reports The Hollywood Reporter . According to The Wrap , starting today “Oprah’s Book Club” will release weekly episodes twice on both Tuesdays and Thursdays. Each episode will feature Oprah — and an author — in talks with various big-name guests to discuss a popular book or novel. As part of its first installment, the eight-part miniseries will feature Pulitzer Prize-winning author Isabel Wilkerson. The two will discuss Wilkerson’s best-selling book, “Caste: The Origins of Our Discontents” — a nonfiction work that illustrates the hidden hierarchy of human ranking that defines America. “I am honored and thrilled that ‘Caste’ has been chosen for Oprah’s Book Club and that its humanitarian insights will now reach a wider audience,” Wilkerson shared in a statement . “This work shows that the term racism may be insufficient in our current era. We...