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

May 17, 2013 at 10:01 AM ET

Video: Using online classifieds, Dateline’s Chris Hansen tracks down people looking for and offering a variety of unbelievable goods and services, from a “vampire” searching for human blood to drink, to a hit man who calls himself “the problem eliminator.”

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.