1. A method comprising: accessing a plurality of content items, each content item associated with a geographic location; receiving, from a viewing user, a request to present a geographic map via a map interface; determining a threshold distance for aggregating content items associated with the viewing user for geographic map presented by the map interface; performing an aggregation process to generate a new aggregated content item from the plurality of content items associated with the viewing user, each content item of the plurality associated with an action performed by a user connected to the viewing user via a social networking system, the aggregation process comprising: selecting a pair of content items, from the plurality of content items associated with the viewing user, for which the geographic locations of the selected pair of content items have a shortest distance therebetween, determining that the distance between the geographic locations of the selected pair of content items is within the threshold distance, combining the selected pair of content items into the new aggregated content item, adding the new aggregated content item to the plurality of content associated with the viewing user, and determining a geographic location for the new aggregated content item as a weighted average of the geographic locations of the content items associated with the new aggregated content item, wherein the weighted average weighs a geographic location based on an affinity of the viewing user with the content item associated with the geographic location, the affinity of the viewing user with the content item determined based at least on past interactions of the viewing user with the social networking system, the past interactions associated with the content item; repeating the aggregation process until the shortest distance between a pair of content items, from the plurality of content items associated with the viewing user, is larger than the threshold distance; and sending for display to the viewing user the map interface with the new aggregated content item displayed thereon at their corresponding geographic locations.