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Surprised to find out how easy it is for someone else to access that information. cnn's ted rowlands is in los angeles with details. >> yib using an iphone or 3g enabled ipad is affected. basically what happenses is everywhere you sgoe trago is tr. this is an application that we loaded using the data from my iphone and you can see where i've been over the past year. you could easily see where someone has ben and when they were there. the application to launch the map is available for free on democratic li online. the pore is al information is also automatically transferred to any computer sync...

Exactly behind that curtain. >> reporter: facebook says ads are pabased around what people t in it their profiles. we don't share and never sell personal identifiable information to advertisers. one long term technology writer in silicon valley who explored the business says the ad part is only growing. >> they did a couple billion dharss of advertising last year and may double that this year. so it seems that the advertising chain started to take off there. >> and that technology blogger adds that facebook's last foray into public adds was in 2007 and it backfired because of privacy concerns....

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