yes, i am a vampire. we re back undercover. i m chris hansen with dateline nbc. and it s wild every than ever. how do you justify that. are you a hit man? i don t know what you re talking about. i have to tell you you re sounding like a pathological liar. no. tonight we investigate the crazy world of the online classifieds. websites. who puts a baby on craigslist? where anything goes. this time around, there are pills. this would violate fda rules. stills. this is a picture that you posted. that s not really you, is it? and chills. when was the first time you consumed human blood? it might make your blood run cold. how many vampires are there? there s a lot of us out there. tonight it s all on the wild wild web. we re back in the online classifieds where billions of people worldwide sell, share and offer services on sites like craigslist and back pai. and with just a few clicks, you can find some very strange things. last time around