Abstract: Data associated with an online ad is transmitted over a network from an ad-serving service to a financial-services website that maintains a payment account for each of a plurality of account-holder members of a social-networking website. Each of the plurality of account-holder members has expressly given the financial-services website limited authority to use data associated with a payment account for the account-holder member to target ads on the social-networking website without sharing the data associated with the payment account with the social-networking website. Software at the social-networking website receives data from the financial-services website that includes one or more account-holder members who have been identified as potential targets for the online ad. Then the software at the social-networking website presents the online ad through a graphical user interface (GUI) to at least one of the account-holder members who have been identified as potential targets for the online ad.