15. A method, comprising: generating, by at least one computing device, a user interface to facilitate creation of a plurality of user-created item lists via a plurality of client devices; receiving, by the at least one computing device, the plurality of user-created item lists from the plurality of client devices via the user interface rendered on the plurality of client devices; maintaining, by the at least one computing device, an item list registry including the plurality of user-created item lists, individual item lists of the plurality of user-created item lists including a respective plurality of items and having a respective item list title; for the individual item lists, comparing, by the at least one computing device, at least one title term of the respective item list title with a plurality of predefined keywords; for the individual item lists, assigning, by the at least one computing device, a keyword tag associated with a particular predefined keyword of the plurality of predefined keywords to individual items in the respective plurality of items in response to the particular predefined keyword matching the at least one title term; creating, by the at least one computing device, an item category associated with the particular predefined keyword; and populating, by the at least one computing device, the item category with at least one of the plurality of items included in a particular item list of the plurality of user-created item lists when a number of keyword tags corresponding to the particular predefined keyword and assigned to the at least one of the plurality of items reaches a predefined threshold.
15. A method, comprising: generating, by at least one computing device, a user interface to facilitate creation of a plurality of user-created item lists via a plurality of client devices; receiving, by the at least one computing device, the plurality of user-created item lists from the plurality of client devices via the user interface rendered on the plurality of client devices; maintaining, by the at least one computing device, an item list registry including the plurality of user-created item lists, individual item lists of the plurality of user-created item lists including a respective plurality of items and having a respective item list title; for the individual item lists, comparing, by the at least one computing device, at least one title term of the respective item list title with a plurality of predefined keywords; for the individual item lists, assigning, by the at least one computing device, a keyword tag associated with a particular predefined keyword of the plurality of predefined keywords to individual items in the respective plurality of items in response to the particular predefined keyword matching the at least one title term; creating, by the at least one computing device, an item category associated with the particular predefined keyword; and populating, by the at least one computing device, the item category with at least one of the plurality of items included in a particular item list of the plurality of user-created item lists when a number of keyword tags corresponding to the particular predefined keyword and assigned to the at least one of the plurality of items reaches a predefined threshold. 18. The method of claim 15 , wherein a first item of the respective plurality of items in a first item list is the same as a second item of the respective plurality of items in a second item list.