11. An electronic system comprising: one or more processing devices; and one or more machine-readable hardware storage devices storing instructions that are executable by the one or more processing devices to perform operations comprising: obtaining search results responsive to a search query submitted by a user; determining, based on usage of a social network by the user, a maturity score for the user, where the maturity score represents a measure of user development of the user within the social network; for a particular type of content associated with a search result, retrieving, from a set of utility score instructions, a utility score instruction for the particular type of content; wherein the utility score instruction defines, for the particular type of content in the social network, a relationship between a utility score and the maturity score; and wherein the utility score represents a measure of utility of the particular type of content to the user as defined by the measure of user development in the social network; and wherein the utility score is determined independent of user input; wherein defined relationships across the set of utility score instructions promote a first pre-defined type of content among less mature users of the social network relative to other maturities of other users of the social network and promote a second pre-defined type of content among more mature users of the social network relative to the other maturities of the other users of the social network; determining, based on the set of utility score instructions and the maturity score, utility scores for the search results; and adjusting rankings of the search results based on the utility scores.
13. The one electronic system of claim 11 , wherein the search results are ranked in accordance with the relevance scores, and wherein adjusting comprises: re-ordering the search results ranked in accordance with the relevance scores.