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What caused your niche interest/hobby to blow up in terms of popularity?
(self.casualconversation)
Share a story, ask a question, or start a conversation about (almost) anything you desire. Maybe you'll make some friends in the process.
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Science fiction conventions. Back in the day, a World Science Fiction Convention ("WorldCon") was incredible when the reached over 1000 people. New York Comic Con has almost 180,000 people last I checked. And adjacent to that, anime. It used to be niche weirdos in basements in the US but now in an enormous industry.