7. A method comprising: receiving information about a user of a social networking system, the information describing connections between users of the social networking system and actions taken by users on the social networking system; responsive to the received information, mapping the received information about the user to predictive factors in predictive models for income brackets in the social networking system; determining, by a computer processor, a correlation value for each income bracket for the user based on the predictive model corresponding to the income bracket; associating the user with at least one of the income brackets based on the determined correlation values; providing advertisements for display to the user based on the associated income brackets and determined correlation values; and modifying the predictive model of an income bracket to include or exclude additional predictive factors based on an analysis of conversion rates of advertisements provided to users based on the income bracket.
7. A method comprising: receiving information about a user of a social networking system, the information describing connections between users of the social networking system and actions taken by users on the social networking system; responsive to the received information, mapping the received information about the user to predictive factors in predictive models for income brackets in the social networking system; determining, by a computer processor, a correlation value for each income bracket for the user based on the predictive model corresponding to the income bracket; associating the user with at least one of the income brackets based on the determined correlation values; providing advertisements for display to the user based on the associated income brackets and determined correlation values; and modifying the predictive model of an income bracket to include or exclude additional predictive factors based on an analysis of conversion rates of advertisements provided to users based on the income bracket. 11. The method of claim 7 , wherein the received information about the users of the social networking system includes, for each user, an analysis of posted content by the user indicates a lower-than-average income potential as compared to other analyses of posted content by other users in the social networking system.