How ads are selected: For Readers The sites and apps you use work with online advertising companies to provide you with advertising that is as relevant and useful as possible. Personalization may be informed by various factors such as the content of the site or app you are using, information you provide, historical searches you conduct, what your friends or contacts recommend to you, apps on your device, or based on your other interests. What choices do I have? Visit the Network Advertising Initiative (US) and the Digital Advertising Alliance  – DAA (US), EDAA (EU), DAAC (Canada), ADAA (AU/NZ) to see your opt-out choices from other participating companies.