time. the original concept was coined in a novel by neil stevenson. a sci-fi novel called snow crash, decades ago. it basically was this immersive virtual world where you bark virtual goods and had virtual avatars and went to virtual parties. it was this immersive virtual world,. the way facebook is using it is a little confusing. but it means the are and glasses that you would wear that would protect things on the environment in front of you. the ability to seamlessly flow between talking with your friends and going to a concert in the er, talking to dinosaurs and whatever else you would be encountering there. but this is basically their catch all term for things that are new to them, that they're working on. emerging technologies. and i agree with kara, i don't think this is actually going to appeal to young people. but i do think the that ideas like this will happen and will come out in the next few years. and it will be really interesting to see how facebook reacts to that. >> all right, kevin roose and