Fast Company: Arianna Huffington is hosting office hours, and the questions are arriving fast and furious. “Is there a healthy balance for venting, or is all venting bad?” The students in “Thrive” — an online course developed by the Oprah Winfrey Network, based on Huffington’s self-help best seller — are anxious for answers, and Huffington, equal parts elegant and maternal in her lace-trimmed blouse, is happy to comply.