Techniques for inferring social affinity may include the following operations: obtaining information derived from online activity of a first party, where the online activity includes searches initiated by the first party, and where the information specifies interaction of the first party with content accessed through the online activity; determining, based on the information, that an amount of the interaction of the first party with the content exceeds a threshold; following the determining, identifying a second party who provided the content; adjusting, in a social graph for the first party, an affinity of the second party to the first party based on the amount of the interaction with the content; and using the affinity to promote search results output to the first party that contain content that is provided by the second party.
Inferring social affinity based on interactions with search results