iOS 6 added a feature called Identifier for Advertisers. It's a unique number that follows you wherever you surf online. Advertisers can use it to track you. To disable it, go to Settings>>General>>About>>Advertising. Look for the section labeled "Limit Ad Tracking" and turn the slider to the "On" position (yes, I said "On"). Then, load http://oo.apple.com in your gadget's browser. A screen that asks if you want to opt out of Interest Based iAds will pop up. Move the slider to the "Off" position. You'll still see ads, but they won't be targeted.