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'Vampires,' hit men and more lurk in shocking online classifieds

Here's a quick look at Chris Hansen's upcoming video series "Wild Wild Web," that you can see in a new 2-hour Dateline that airs Friday night at 8 p.m. on NBC.

Here's a quick look at Chris Hansen's upcoming video series "Wild Wild Web," that you can see in a new 2-hour Dateline that airs Friday night at 8 p.m. on NBC.