this book is cald loc. "lacombe anima/persona." >> rose: samaltman is here he is the found of loopt a mobile networkin applicatio which allows urs to locate friends on their network. he came up with the ia while a sophomore at stanford. today lot has overone million ers, major u. carers including spri, at&t and rizon all offer the service. loopt is another example of how people now use their cell phone for re than just to talk. i am pleased to have samltman this table for t first time. welcome. >>hank you, charlie. >> rose: what isoopt about an y is itimportant? >> loopt is abt peoplesing their cellhones to conct to the world around them the importance o cell phone technology in our ves has really taken off in a way i thk few of usver predicted. the average u.s. teenager sends almost 2,000 text messages per month. the dependence on this device and how engrained this s become in our ves is incredible. e of the unique things about these deces that hasn't exted in the web wod is that they kw where they are. th