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Political writer for the New York Times, nick confessorry and the president of the counsel on Foreign Relations and author of the book a world in disarray Richard Haass also with us. Pulitzer prize winning historian jon meacham. Meachum delivered one of the yueulogies at Barbara Bushs funeral on saturday. So many people this weekend talking about barbara bush and really agreeing with johns assessment that she really has been for such a long time as americas first lady. America said goodbye to barbara bush, jon meacham, this weekend. You were there and delivered a beautiful, beautiful word in h...

President. we'll ask who "they" are. plus the man who knows all about the cambridge analytica scandal, alexandr kogan developed the app that mined the info in the first place. he joins us next. we'll be right back. they appear out of nowhere. my secret visitors. hallucinations and delusions. the unknown parts of living with parkinson's. what plots they unfold, but only in my mind.

Conversation that is important about privacy. fundamentally i think what silicon valley was doing and still believes is everybody knows as far as the general public but nobody cares and the folks that do care -- and there's few of them -- will read the terms of service and decide and the other few folks that care will go in the settings and find the drivesy tool sprivacy them. but i think that's wrong. we see folks do care about how their data is used even if they weren't doing those things. there's a big responsibility for tech companies to do something about it but it's difficult when you've...

>> if a developer who people gave their information to, in this case alexandr kogan, then goes and in violation of his agreement with us sells the data to cambridge analytica, that's a big issue. people have a right to be very upset. i'm upset that that happened. >> that was facebook ceo mark zuckerberg pointing the finger at where he believes the blame lies when it comes to apps that surreptitiously gained access to personal data mined from nearly 87 million facebook users and the developer who is singling out on this is cage university researcher doctor alexandr kogan who joins us now. al sa...

Name and terms of service and they say in their policy that, hey, we can monitor this, we can make sure that everything is compliant and they clearly don't or if they are doing it they don't care and they aren't reaching out to correct anything because this was up there for a year and a half, not a word. like i said, it felt very much like business as usual. there's tens of thousands of apps that are doing this. from our perspective, we're doing something normal. >> joe? >> so alexandr, we saw zuckerberg testify before congress. he said you were an outlier. he said that you violated their poli...