15. A system comprising: one or more computer memories collectively storing content items and instructions configured to cause one or more processors to control performance of a method comprising: associating subsets of content items with corresponding strings of one or more overloaded keys of a keypad so that the subsets of content items are directly mapped to the corresponding strings of one or more overloaded keys by a direct mapping, wherein at least one overloaded key of the one or more overloaded keys is associated with a plurality of alphabetical and/or numerical symbols; ranking content items within at least one of the subsets of content items according to one or more ordering criteria; subsequent to the associating and ranking, receiving entry of a first overloaded key, selecting and presenting a first of the subsets of content items that is associated with the first overloaded key based on the direct mapping, subsequent to receiving entry of the first overloaded key, receiving entry of a second overloaded key the same as or different than the first overloaded key, the second overloaded key forming a string with the first overloaded key, and selecting and presenting a second of the subsets of content items that is associated with the string of overloaded keys formed by the first overloaded key and the second overloaded key based on the direct mapping.
15. A system comprising: one or more computer memories collectively storing content items and instructions configured to cause one or more processors to control performance of a method comprising: associating subsets of content items with corresponding strings of one or more overloaded keys of a keypad so that the subsets of content items are directly mapped to the corresponding strings of one or more overloaded keys by a direct mapping, wherein at least one overloaded key of the one or more overloaded keys is associated with a plurality of alphabetical and/or numerical symbols; ranking content items within at least one of the subsets of content items according to one or more ordering criteria; subsequent to the associating and ranking, receiving entry of a first overloaded key, selecting and presenting a first of the subsets of content items that is associated with the first overloaded key based on the direct mapping, subsequent to receiving entry of the first overloaded key, receiving entry of a second overloaded key the same as or different than the first overloaded key, the second overloaded key forming a string with the first overloaded key, and selecting and presenting a second of the subsets of content items that is associated with the string of overloaded keys formed by the first overloaded key and the second overloaded key based on the direct mapping. 19. The system of claim 15 wherein said method comprises receiving entry of a plurality of overloaded keys corresponding to one or more words in an ordered format, the plurality of overloaded keys comprising the string.