Plot: In Daniel Goldhaber and Isa Mazzei's paranoid horror thriller "Cam," an erotic webcam performer finds her followers stolen by a doppelganger who hijacks her channel, pushes the sexual envelope further, and otherwise seems determined to destroy her life. Call it identity theft of a possibly supernatural kind.
Alternative Plot: A camgirl has her principles, until a mysterious woman who looks just like her takes over her channel.
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