Users got more than an improved Siri and the new Passbook app when they upgraded to iOS 6. Apple's latest mobile OS has given advertisers a brand new way to track your Web surfing.
It's called Identifiers for Advertisers, or IFA. When you upgrade your existing gadget - or buy a new iPhone 5 - that gadget will be assigned a random IFA number. When you look at a Web page or an app, advertisers see your number and the site you were browsing. Once they know that, it suddenly becomes easy for them to target ads directly to you.
Apple hasn't advertised this feature much, so not many people know how to turn it off. Plus, the setting isn't where you'd expect. You have to go to Settings>>General>>About>>Advertising. Look for the section labeled "Limit Ad Tracking". Confusingly, by default this is set to Off. In order to stop advertisers from seeing your unique number, you have to switch the
slider to On.
Courtesy of Kim Komando. Read more here - http://www.komando.com/tips/index.aspx?id=13447
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