u.s. who is being subject to sexual exploitation. >> you may remember cnn doing an investigation on craigslist. in fact one of our reporters, amber lyon actually caught up with the founder of craigslist, craig newmar. we'll look back at her piece. here is just an example of it. >> you guys say you screen all these ads manually. ? >> i don't know what this is. >> jim buckmaster says these are being screened, why do i have the responsibility to report this to you when it's your website? you're the one posting this online. >> and more of that coming your way in the 7:00 eastern hour, top of the hour, 7:00 eastern, 4:00 pacific. it has been a month now that those miners in chile have been trapped underground, a month now. 33 men have been trapped down there. the miners are getting words of encouragement from family members. they spoke to their loved ones