Systems and methods for automatically generating targeting information for presentation of an offer in accordance with embodiments of the invention are disclosed. One embodiment includes indexing member profiles within one or more social networks for affinity to keywords using a targeting system that retrieves data concerning member profiles and activities from servers within an online social network, identifying member profiles that have affinity for at least one offer keyword using the targeting system and the index, identifying additional keywords for which the identified member profiles have affinity using the targeting system and the index, determining a set of keywords that target a desired audience based upon the identified additional keywords using the targeting server, and targeting presentation of advertisements for the specific offer to members of an online social network using the online social network and the targeting keywords determined by the targeting server.