Limit ad targeting on iPod touch
Turn off location-based ads, reset or limit targeted advertising in App Store and News, and prevent cross-site tracking in Safari.
Turn off location-based ads and offers
Go to Settings 
> Privacy > Location Services > System Services, then turn off Location-Based Apple Ads.
Reset or limit ad tracking
Go to Settings > Privacy > Advertising (at the bottom of the screen), then do any of the following:
Clear the data used to determine which ads might be relevant to you: Tap Reset Advertising Identifier.
Opt out of targeted advertising: Turn on Limit Ad Tracking.
Note: When you turn on Limit Ad Tracking, you may still receive the same number of ads, but they may be less relevant to you.
View the information Apple uses to deliver targeted ads
Go to Settings > Privacy > Advertising > View Ad information.
The information is used by Apple to deliver more relevant ads in the App Store and News. Your personal data isn’t provided to other parties.
Keep your Safari browsing activities to yourself
While browsing the web, you can prevent cross-site tracking, block cookies, erase your browsing history, and more. See Browse privately in Safari on iPod touch for Safari.
Learn more about privacy and Apple’s advertising platform
Go to Settings > Privacy > Advertising > About Advertising & Privacy.