The Stalk reference article from the English Wikipedia on 24-Apr-2004
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Stalk

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To stalk is to follow surreptitiously with intent to acquire private information or objects. The object of such an effort is commonly referred to as the stalk-ee, while the perpetrator is known as a stalker.

Common victims of stalking include celebrities, ex-girl and -boyfriends, and teachers. In more extreme cases, stalking leads to sex.