Which 1999 film pioneered viral marketing in the movie industry with its groundbreaking 'missing persons' campaign that pretended the fictional events were real documentary footage?

In the ever-evolving world of film marketing, certain campaigns have completely transformed how movies are promoted. One particular marketing innovation revolutionized the film industry by creating unprecedented audience anticipation while revealing almost nothing about the actual film. This guerrilla marketing approach has since influenced countless movie promotions and changed how studios build pre-release hype.

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The Blair Witch Project
The Sixth Sense
The Matrix
Fight Club