My Occidental College colleague, politics professor Caroline Heldman, snapped this photograph of a billboard on an L.A. freeway. It suggests that one may celebrate Black History Month by calling 1-800-GET-THIN. The billboard is another stunning example of the trivialization of black history by companies using it only as an excuse to market their product or service.Lisa Wade, PhD is a professor at Occidental College. She is the author of American Hookup, a book about college sexual culture, and a textbook about gender. You can follow her on Twitter, Facebook, and Instagram.