1. A computer-implemented method for comparing query-related objects, comprising: receiving a first plurality of query-related objects for a first user; receiving a second plurality of query-related objects for a second user, wherein both the first and second plurality of query-related objects include objects of different object types; determining a degree of similarity between the first and second plurality of query-related objects of the same object type, comprising: determining a plurality of query-related objects based on their frequency of use in composing queries; and calculating the degree of similarity based on comparing the first plurality of query-related objects of each object type with the second plurality of query-related objects of the same object type, wherein the degree of similarity is reduced upon determining that the first plurality of query-related objects and the second plurality of query-related objects contain at least one query-related object that is similar to one of the determined plurality of query-related objects; and upon determining that the degree of similarity exceeds a predefined threshold for similarity, issuing a notification of the degree of similarity to the first user, wherein the notification identifies the second user using contact information associated with the second plurality of query-related objects.