i had a fella named frank ahern visit me in atlanta, a skip tracer.n the internet and find it go increasingly difficult task. >> i'm going to send an e-mail to a lawn service company. ahern says that detailed information is something investigators never had. according to the chip maker intel, we send 204 e-mails every minute. the information about us contained in them is nearly limitless, says ahern. and you'd get phone records and say frank called, you know ted whatever hour. they didn't know the conversation twen frank and ted. with e-mails, frank e-mailed ted and this is what he wrote. if you delight things from your account do you-- >> the only delete button is on the laptop, there's no delete button on the internet. >> the internet is forever? >> the internet is forever. we're living in the era called big data. the concern, will that be big brother, is the government watching everything we do. certainly we know the political campaigns are and show you tonight how in 2012 president obama's campaign used all of those little digital trails at that w