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There have been conspiracy theories as long as there have been conspiracies, since the beginning of time.
The most common conspiracy theories include the assassination of JFK, the death of Elvis Presley, and 911.
Conspiracy theories exist, so yes, they are real. However, they are almost invariably wrong, so no, they are not true.
Conspiracy theorist, or nut job.
Former Navy Seal, Wrestler, Governor of Minnesota, host of canceled TV show on conspiracy theories