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Type "mind control" or "gang stalking" into Google, and Web sites appear that describe cases of persecution, both psychological and physical, related with the same minute details — red and white cars following victims, vandalism of their homes, snickering by those around them.

According to Dr. Vaughan Bell, a British psychologist who has researched the effect of the Internet on mental illness,

[the] extent of the community ... poses a paradox to the traditional way delusion is defined under the diagnostic guidelines of the American Psychiatric Association, which says that if a belief is held by a person's "culture or subculture," it is not a delusion. The exception accounts for rituals of religious faith, for example.