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The unprecedented success of "Obsession" and "Backrooms" — both produced by YouTubers in their 20s — represents Gen Z's power in driving what could be a historic shift for Hollywood.

Why it matters: Major movie studios have spent years trying to crack the code on organic social media marketing.

By the numbers: What made the box office debuts of both "Obsession" and "Backrooms" so surprising is how well they fared against major studio releases last month.