Have you ever used an Internet detective agency to locate a long lost friend?

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Lately I've been seeing these ads for onine detective agencies or cyber detectives. They use the power of the Internet to access public records to track down people. Sometimes they track down dead beat dads who don't pay child support. Other times they help locate missing children. Or, just find friends who have become lost to us. I have thought about using these Cyber detective agencies. It sounds so fascinating. Have you ever used a detective agency to track down a friend who has moved away and lost contact with you?