11. The method of claim 1 , wherein the organizational relationship is a set of non-hierarchical groups.
1. A user-interface method of selecting and presenting a collection of content items, the method comprising: providing access to a set of content items; determining an organizational or social relationship of the user to at least one other person and inferring a likelihood of the user wanting to contact the other person based on the organizational or social relationship; determining a relevance of at least one content item of the set of content items to the other person; associating a relevance weight with the at least one content item, wherein the associated relevance weight is based in part on the likelihood of the user wanting to contact the other person; receiving input entered by the user for identifying desired content items; in response to the input entered by the user, selecting and presenting a subset of content items to the user as a hierarchy of content items browsable by the user, wherein the content items are ordered at least in part by the initial associated relevance weights of the content items.