6. The computer-executed method of claim 1 , wherein determining an affinity score comprises: determining an intersecting population of social media users comprising the social media users that are present in both the first and second populations; determining the affinity score based on the intersecting population.
6. The computer-executed method of claim 1 , wherein determining an affinity score comprises: determining an intersecting population of social media users comprising the social media users that are present in both the first and second populations; determining the affinity score based on the intersecting population. 10. The computer-executed method of claim 6 wherein determining the affinity score comprises inferring the affinity score based on a correlation between a plurality of other affinity scores.