7. The method of claim 2 , wherein generating the aggregate user model comprises: correlating personality trait values, for each personality trait specified in the user models of the set of users, to identify correlated personality trait values from among the user models; eliminating non-correlating personality trait values that are more than one standard deviation away from other similar personality trait values; and summing, for each personality trait specified in the user models, the correlated personality trait values to generate an aggregate score for each personality trait.
8. The method of claim 7 , wherein correlating personality trait values comprises: calculating a standard deviation for all personality trait values specified in the user models for a selected personality trait; generating a plurality of brackets of personality trait values for the personality trait, wherein each bracket in the plurality of brackets represents a separate and distinct range of personality trait values from the other brackets in the plurality of brackets; and associating each personality trait value in the personality trait values specified in the user models with one of the brackets in the plurality of brackets.