Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for providing compensation. In one aspect, a method includes receiving a request for an advertisement, and identifying an advertisement responsive to the request, wherein a good or service associated with the advertisement is associated with an endorsement provided by an endorser. The advertisement is provided in response to the request. An indication of a selection of the advertisement is received, and compensation is provided to the endorser upon receiving the indication of the selection of the advertisement.
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