>> most of the young people we've worked with who have been exploited online talks about craigslist them don't talk about the other sites. craigslist is like the walmart of online sex trafficking right now in this country. >> we post ads around like four or five and wait for you to get a call. wait to get a call. >> from everything we understand, when they are being exploited by a pimp or a trafficker, more accurately described, the trafficker is keeping the money. >> if i didn't get it, yeah. he would beat me. >> reporter: so we're here at george washington university and we just found pout craig newmark, the founder of craig list, will be speaking today at a tech conference. he doesn't know we're coming. he's been very media shy about all these allegations against him. he is the craig in craigslist. it is his list. >> can people trust that children are not being sex trafficked on craigslist? >> i think we explained that pretty thoroughly on our blog. >> reporter: that's where jim