If there's any Twitter account that's actually worth following, it's Mark Hamill's. He embodies positive fan interaction, and perhaps nothing is a better example of that then his response to a female Luke Skywalker cosplayer.
Hamill was asked on Twitter, "can I go to comic con as Luke Skywalker even though I'm a girl? I'm doing it anyways :) #wigsarefun" Here was his response:
— Mark Hamill (@HamillHimself) June 14, 2016
It's the Light Side of the Force, personified. And one of the too-rare instances where engaging with someone on Twitter isn't a horrible, depressing mistake.