27. The computer readable non-transitory storage medium of claim 25 , the social network kernel comprising a network of nodes and edges, each node corresponding to an individual represented in at least one content item of the plurality and each edge indicating a relationship between two individuals represented together in at least one content item of the plurality of content items.
27. The computer readable non-transitory storage medium of claim 25 , the social network kernel comprising a network of nodes and edges, each node corresponding to an individual represented in at least one content item of the plurality and each edge indicating a relationship between two individuals represented together in at least one content item of the plurality of content items. 28. The computer readable non-transitory storage medium of claim 27 , the social network kernel further comprising a weight associated with each edge, the weight identifying a strength of the relationship between the two individuals.