“Trekkies” are known the world over (though they’d snap back that it’s “Trekkers”). For lovers of “Star Trek,” “Harry Potter” and the like, fandom isn’t just about admiration – try bemoaning a song by Taylor Swift or Nicki Minaj if you want swift justice from their supporters. Michael Schulman joins host Krys Boyd to talk about the rise of superfans and the power they command, which he writes about in The New Yorker.