4. The computer-executed method of claim 1 , wherein determining one of the affinity scores comprises: determining an intersecting population of the users between one of the populations mapped to one of the events or topics, and another one of the populations mapped to the one of the events or topics; determining the affinity score based on the intersecting population.
4. The computer-executed method of claim 1 , wherein determining one of the affinity scores comprises: determining an intersecting population of the users between one of the populations mapped to one of the events or topics, and another one of the populations mapped to the one of the events or topics; determining the affinity score based on the intersecting population. 5. The computer-executed method of claim 4 , wherein determining one of the affinity scores comprises calculating a weighted sum over the users in the intersecting population.