dr. felten's example, if you were to navigate to the social networking site in his example if it were facebook, we would not be sharing with the ad provider that he was edward felten or that he likes jazz. so on facebook a feed is established where people know what uploading and receive timely reactions from their friends. the privacy policy and users experience inform them about how advertising on the service works. advertising that enables us to provide the service free to yearses is targeted to the expressed attributes of a profile and presented in the space on the page allocated for advertising without granting an advertiser access to any individual userrer's profile. unless an user decides otherwise by directly and voluntarily sharing information with an advertiser, advertisers can only target facebook advertisements against non-personally identifiable attributes of an user derived from profile date too. facebook builds and supports products founded on the principles of transparency and user control and we thank you very much for the opportunity to present our philosophy in the approach t