Alex Russell, left, directed Archie Madekwe and Theodore Pellerin in the new film “Lurker,” which is in theaters now. AP

Fandom is a funny thing in the age of social media. Spend enough time scrolling and it’s easy to feel like you really know a celebrity, and all their friends. The new film “Lurker,” a Sundance breakout that opened in theaters Friday , explores the question of what might happen if a certain type of fan got a foot in the door, and what they might do to stay there.

Archie Madekwe’s Oliver hardly knows what’s coming when he walks into a trendy Los Angeles clothing shop. A rising music star, Oliver seems already accustomed to a certain amount of attention wherever he goes, with asks for selfies and autographs just part of the deal. So of course he’s taken aback when o

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