CNBC: Obsessed: How superfans took over the world

What do people dressed up in Harry Potter costumes waiting for a book release have in common with the pilgrims to the annual Berkshire Hathaway meeting?

They’re all devoted superfans, and they’re the subject of the new book “Superfandom: How Our Obsessions Are Changing What We Buy and Who We Are.”

“Fandom is a topic that has a lot of baggage. We associate it with crying tweens at a Bieber concert, or elderly eccentrics collecting beanie babies,” says Zoe Fraade-Blanar, who wrote the book with Aaron Glazer.

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