From two comes many. On Thursday, Facebook is rolling out 50 different terms users can chose to identify themselves as, along with three pronouns: him, her, or them. The options will include androgynous, intersex, bi-gender, transsexual, and gender fluid. The changes are coming to the 159 million American users. "There's going to be a lot of people for whom this is going to mean nothing, but for the few it does impact, it means the world," said Facebook software engineer Brielle Harrison, who is undergoing a gender transformation herself.