1. A system operative on a set of documents annotated by metadata specifying persons associated with documents and their social roles in the documents wherein the annotated documents define a group of representation modes including at least one content type and at least one social role, the system comprising: an electronic processing device configured to compute a relevance score for a person of interest using a set of queries wherein each query has a target social role by performing a sequence of operations that includes the following operations: computing similarities between documents and queries with respect to at least one similarity mode of the group of representation modes, enriching queries or documents to identify and aggregate nearest-neighbor documents that are most similar with respect to at least one enrichment mode of the group of representation modes, aggregating over documents, aggregating over queries, and aggregating over at least one of (i) enrichment modes, (ii) similarity modes, and (iii) target social roles.