1. A method of recommending entities to a user for inclusion as content contributors for a datastream using a computing system comprising: a. automatically identifying with the networked computing system an information contribution provided by each of a base set of content contributing entities selected manually by the user in a white list; b. in response to a user request for suggestions for a first additional content contributing entity for inclusion on said white list, automatically comparing content contributed by said base set of content contributing entities with content contributed by a plurality of candidate additional content contributing entities; c. automatically recommending to said user with the networked computing system a recommendation that one or more selected ones of said plurality of candidate additional content contributing entities be included or excluded from said white list based on a measured overlap in information content between said first additional contributing entity and said one or more of said plurality of additional candidate content contributing entities.