In one embodiment, a method includes receiving an indication of a reward-generating event comprising an action performed by a first user of a social-networking system in response to an advertisement. The advertisement may have been selected by the social-networking system based at least in part on a bid amount from an advertiser. The method may further include updating a social graph of the social-networking system based on the reward-generating event, wherein updating the social graph comprises adding an edge connecting a first node to a second node corresponding to the advertisement or an entity associated with the advertisement. The method may further include determining and allocating a first portion of the bid amount to allocate to the first user and a second portion of the bid amount to allocate to the social-networking system based on the reward generating event.
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