facebook ceo mark zuckerberg got personal in a livestream q&a session with users.ok questions on everything from parenting to pizza. take a listen. >> i guess my view on this important issue -- [laughter] is that if you are going to be eating pizza, you might as well also have fried chicken on top of pizza. >> sarah frier joins us now via skype with more of the highlights. this is the second public q&a that mark zuckerberg has done. we have seen him get much more comfortable handling some of these questions from the public. why is facebook doing these q&a's this way? >> he said in the last q&a that he sometimes doesn't like the fact that a lot of his communication with users happens through journalists -- who likes journalists? he wanted to have an opportunity connect with people directly like facebook does in their townhall meetings, where anyone could ask a question. it's as open as honest and as they could be. >> does he know these questions in advance? does facebook select these questions? >> he knows some of them in advance, and some of them were certainly pre

. >> it's time to sign some books i want to thank all of you that are watching in livestream land and thank you too political for live streaming us and thank you for being here in person. thank you to politics and prose for pulling this together and thanks to sixth and i for this amazing setting and thank you secretary panetta. [applause] [inaudible conversations] >> book tv in prime time continues tomorrow night. author of factory man, battled off shoring, state local. later the destruction of the dollar threatens the global economy. michael lewis, compon of the dollar threatens the global economy. michael lewis, computers buy and sell stock based on complex algorithms. algorithms. in prime time all week. >> here is a look at some of the programs you will find christmas day. the lighting of the national christmas tree followed by the white house christmas decorations and the lighting of the christmas tree. supreme court justice and former florida governor on the bill of rights and the founding fathers. venture into the art of good writing. joe searches the secret history of wonder wo

. >> it's time to sign some books i want to thank all of you that are watching in livestream land and thank you too political for live streaming us and thank you for being here in person. thank you to politics and prose for pulling this together and thanks to sixth and i for this amazing setting and thank you secretary panetta. [applause] [inaudible conversations] next robert gates at the national constitution center in philadelphia. he discusses memoir, duty members of the secretary at war. in the book mr. gates has served as secretary of defense under president george w. bush and president obama talks about his management of the wars in afghanistan and iraq and to share stories about his relationship with the white house and congress. [applause] >> secretary gates i also want to thank you for being especially knowing exactly recently had an injury. i know you are making a robust recovery but having to wear a neck brace as surely complicating your being here and getting here and we thank you for making that effort. >> until i became secretary of defense i have never broken a bone or

it was a social media bonanza, with millions around the world watching on livestream video, as the heads of the european space agency made it clear, score one for europe. >> we are the first to have done that. and that will stay forever. thank you very much. >> not so far off from the global race sparked with sputnik. >> the highly complicated mechanism, transmitting secrets of the universe. >> the russian satellite launched into orbit, and it launched the space race. but there's a big difference. the race to space in the '60s, was fraught with political tension, and a massive competition over the might and technological prowess of super powers. now it's what people in the space information col cooptition. >> this is an example of multiple countries coming together from all across the globe to work on a collaborative project. the biggest we have ever attained to require the labors and the investments. >> as a result of tensions over ukraine, the u.s. announced it was suspending all joint space programs with russia, except for the space station. nasa still rise on russia to spend american

. >> it's time to sign some books i want to thank all of you that are watching in livestream land and thank you too political for live streaming us and thank you for being here in person. thank you to politics and prose for pulling this together and thanks to sixth and i for this amazing setting and thank you secretary panetta. [applause]

they're all livestreaming to a degree depending what market you're in and what you want to watch.re, slipping through all the channels. that's where they want to go. >> the transformation is certainly under way but will we make this move where tv is the past? >> that's definitely the future. people are watching on different devices. the cable companies may be worried about this but if you think about it you still get your internet service from your cable provider. if you're watching everything online versus through the cable box you're paying time warner. >> where do you think this all ends up then? >> in the future i think -- this could be ten years, 20 years -- sort of like when print newspapers are going go out. we'll probably transition to a model where we're getting everything over itt, internet tv versus the cable line coming into your house, but if it works out well to tend user it's going to be fairly transparent because you're going to be able to watch all the channels live or on dvr. >> it also seems more efficient. watching exactly what you want. >> even now, if you try

. >> i actually have a question for someone watching livestreaming.re there any observable differences in ptsd between male and female soldiers and do they cope with it differently and are there symptoms similar? >> the diagnostic criteria are the same for men and women. an individual might have a different constellation of the symptoms are relieved that diagnostic criteria are the same for men and women. i think that women are more likely to have a concomitant depression with it that men aren't but that's only speaking very generally. between individuals i don't think you can specifically say there are differences between the genders. >> individuals that have been suspected as having ptsd have they exhibited an eagerness to -- because you said that hypervigilance, anxiety and fear. you can't act that way at walmart so do they want to go back to war or any sort of violence so they feel they are acting normally or they are feeling comfortable? >> i think it's more accurate to say they feel more comfortable back in a combat environment so it's not neces

. >> it's time to sign some books i want to thank all of you that are watching in livestream land and thank you too political for live streaming us and thank you for being here in person. thank you to politics and prose for pulling this together and thanks to sixth and i for this amazing setting and thank you secretary panetta. [applause] [inaudible >> it goes in a way, and goes to the equipment question you asked me. secretary rumsfeld famously said to soldier, you go to war with the army you have. and that's true. but what i add is, then you better make it into the army at you need as fast as you can. and that's what i think we did not do. >> i have to ask you this. you mention in the book, and i think i have this right, that your good friend brent scowcroft, very senior national security official was in bush 41 i think it was, the first bush administration, opposed the invasion in iraq. you never really address the issue as far as you're concerned in this book. had you been part of the ministratministrat ions in, would you have supported the iraq war? >> well, i say in the last cha

. >> pat where livestreaming this program tonight and we asked our viewers to submit their questions on e-mail and i'm going to ask one of them from gary kim of denver colorado. what are your memories of election night of 1968? him. >> well they are fairly terrifying. [laughter] teddy white in his book says in some of you will know the fellow's name. he said coming across the country what we did is after we had our telephone that monday night we got on the plane and nixon flew across the country as the country was voting. my hands broke out in hives and i've never been able to explain it. i'm sure it was some kind of nerves but teddy white writes in his book that on the night of the election buchanan and finch were the most nervous and bob haldeman the most confident. i think that is right. let me tell you a story. on saturday before the election i got a call from john sears who was one of our political guys in the said pat, michigan is gone and we are three down in paris. in other words the harris poll had them at 43 and a set of 40. if that were true the election was over so i went