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Tens of thousands of internal documents, and that research, she says, shows facebook needs to hit the reset button. >> they're paying for their profits right now with our safety. >> reporter: former facebook employee frances haugen told senators facebook is looking to hook kids early, hoping they'll also bring their parents online. but she says the company's own research shows its instagram platform can be harmful to teens, even addictive, especially for some girls. >> it's just like cigarettes. teenagers don't have good self-regulation. they say explicitly "i feel bad when i use instagram and...

Sleep talking. you are a dog i.>> this is why you get a captioning sponsored by cbs >> o'donnell: tonight, the facebook whistleblower urges congress to act, comparing the socialg media giant to big tobacco, warning the health of the nation is at risk. rivetting testimony from a former employee, calling facebook an urgent threat to america's children and blame founder mark zuckerberg, who she says knows the social network is hurting people. >> the buck stops with mark. no one currently holding mark accountable but himself. >> o'donnell: state of emergency: the race tonight to protect california...

>> reporter: haugen says c.e.o. mark zuckerberg is facebook's ultimate decider. >> mark hold a very unique role in the tech industry. there are no similarly powerful companies as unilaterally controlled. >> reporter: why is mark zuckerberg right now? >> i work with mark zuckerberg closely. i can tell you he cares a lot about these issues. he always has. >> reporter: monika bickert is a facebook vice president. does the buck stop with you, or does the buck stop with mark zuckerberg? >> everybody who is working on these issues at facebook, starting with mark, but continuing down to anybody on th...

The scathing testimony from a former facebook employee that had senators describing the social media giant as morally bankrupt. frances haugen went before congress today to tell lawmakers the company has a simple motive-- maximize profits no matter the cost, something she first told "60 minutes." republicans and democrats were united in their outrage as haugen described how teens get hocked on instagram and are subjected to nonstop bullying. tonight the company is responding and taking aim at haugen. but senators want to hear directly from founder mark zuckerberg, demanding that he answer thei...

Right to just have blind trust in them. >> reporter: this was that rare hearing where you had near-unanimous consent, republicans and democrats alike, that there needed to be additional regulation of companies lieb facebook, senators saying to each other it's time to get to work. now, facebook says it welcomes dcialg federal oversight. it says the majority of teens do not have a negative experience on instagram and stresses the company does not put profits ahead of people's safety. norah. >> o'donnell: we'll see if congress acts. kris van cleave, thankou well, tonight, a state of emergency has...