2. The method of claim 1 wherein the at least one grouping label, of the plurality of grouping labels, indicates that any content item, having the at least one grouping label, was published by a publisher that belongs to a group of affiliated publishers.
2. The method of claim 1 wherein the at least one grouping label, of the plurality of grouping labels, indicates that any content item, having the at least one grouping label, was published by a publisher that belongs to a group of affiliated publishers. 19. A computer-readable storage medium carrying one or more sequences of instructions which, when executed by one or more processors, causes the one or more processors to perform the method recited in claim 2 .