As Rachel Dolezal’s story unravels on- and offline, the Internet has followed suit with questions of its own. In a recent interview, Dolezal’s parents said they’re “both of Caucasian and European descent,” and their now 37-year-old daughter — the president of Spokane’s NAACP chapter — has been pretending to be black for the last decade. On Twitter today, several hashtags about Rachel were trending, including #transracial – a term that some users seemed to define as the idea that a person could be born as one race but assume another racial identity. The term — and the online conversation around...