Abstract: Multiple entities are tracked over periods of time and information concerning these entities are collected. For each entity, the entities associated with the entity and the types of associations are determined. One or more entities of interest is/are identified. Different weights are assigned to the entities on the trajectories connecting with the entity or entities of interest based on their associations with the entity or entities of interest and their positions on the trajectories. Selected entities are ranked and surfaced based on their total weights for the entity or entities of interest.