24. The method of claim 2 , further comprising: each item having at least one publisher identifier: in the aggregating step, aggregating the annotations for each publisher identifier such that the keywords and the user identifiers associated with the publisher identifier are aggregated from all the annotations corresponding to the publisher identifier; searching based on at least one keyword; determining publisher identifiers that match the at least one searched keyword from the aggregated annotations corresponding to the publisher identifier; and ranking the determined publisher identifiers.
35. The method according to claim 24 , wherein the published item is an advertisement.