It has been an all out battle since the term first arose roughly a year ago when a feminist watched the show and wrote up an article for the first time. Apparently someone told her female fans of the show roll with "Pegasister", and since then it has been a big debate between some who accept the term and some who don't. I usually just roll with the whole "anyone can roll with the brony title". But I do a lot of things that people don't agree with! It's human nature.
So what do you all think? What should the official title for a female fan of the show be?