people into extremist rabbit holes, like you said. they know they could reinforce people's worst tendencies. i think what we have seen from some of these stories is it's especially true in markets where it doesn't make the most money but has huge influence still. >> cecilia, you have written about this. of course this is bigger than a pr crisis. many people would contend it is a threat to democracy. but on the pr piece of this, why wasn't the company prepared for this kind of reckoning? >> i think that facebook is accustomed to being under the spotlight, scrutinized by government officials and the media. they didn't expect a whistleblower, a former employee to come out with thousands of pages of documents that show in great detail how the company decided in many cases not to heed the warnings, as you have mentioned, as well as great