1. A computerized system for facilitating a search of a plurality of items, comprising: a data store storing, at least: a hierarchy of categories that categorize at least some of the plurality of items; a set of search refinements, at least some of the hierarchy of categories being linked to at least some of the set of search refinements; and a refinement surfacing map depicting a plurality of associations between search terms and at least some of the hierarchy of categories; a search module configured at least to generate a search result set of items from the plurality of items that match one or more search terms; and maintain a log of a number of times a refinement of the set of search refinements is selected during searches employing the one or more search terms in one or more time periods; a refinement surfacing module configured to, at least: determine a possibly relevant set of categories of the hierarchy of categories below a distinguished category based at least in part on the log; increase an associative confidence between at least one of the one or more search terms and a subset of the set of search refinements linked to the possibly relevant set of categories based at least in part on the log; and determine the subset of the set of search refinements linked to the possibly relevant set of categories when the associative confidence at least meets a first sufficiency threshold; a user interface module configured at least to, as least provide the search result set of items and said subset of the set of search refinements for presentation; constrain subsequent search result sets to a particular distinguished category, based at least on the one or more search terms, when the associative confidence meets at least a second sufficiency threshold; and one or more processors collectively facilitating at least the data store, the search module, the refinement surfacing module and the user interface module.