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Tim Wood sat on a chair inside a house in Hinsdale, N.Y., long rumoured to be haunted. He had a Ouija board in his lap and was livestreaming the experience to a group of fans on YouTube.

“You’re not ever supposed to do Ouija alone, let alone in a place that had an exorcism done in it,” he said to the empty room.

As he filmed last month, the comments rolled in, some admiring (“You are one brave ghost hunter”), others fearing for his safety (“Tim, don’t summon what u can’t banish”).

Mr. Wood, 39, has amassed a small but loyal following by