INFERRING SOCIAL AFFINITY BASED ON INTERACTIONS WITH SEARCH RESULTS

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.