Source: http://www.engadget.com/2013/09/13/adafruit-tutorial-raspberry-pi-ad-blocking/
Ads can be a buzzkill, especially when they're so pervasive they become distractions. Luckily, Adafruit has a new tutorial that turns your Raspbery Pi into a WiFi access point that doubles as a mighty ad-blocking machine for any device -- be it an iPad or an Xbox -- that connects to it. All you need is a working internet connection, a Raspberry Pi booting Raspbian, a WiFi adapter, an Ethernet cable and the necessary software (which the tutorial breaks down for you). It should go without saying, but Adafruit also includes a reminder to whitelist the ad-supported sites you frequently visit. Blocking ads might improve your online experience overall, but it's always a good idea to support the people who provide you with free content. To get started, check out the tutorial at the source link below.
Source: Adafruit