A system for providing digital content identified in a celebrity content list without disclosing the list to an end user, comprising: a first mobile computing device associated with a particular celebrity, the first mobile computing device having a celebrity content list stored therein, wherein when the particular celebrity uses the first mobile computing device to listen to or view specific digital content, the first mobile computing device will, in response to the particular celebrity viewing or listening to the specific digital content, automatically update the celebrity content list to add the viewed or listened to digital content; at least one database storing a copy of the celebrity content list, such that the first mobile computing device wirelessly transmits to the at least one database notification of the automatic update and the copy of the celebrity content list is automatically updated in the at least one database in response to a change in the celebrity content list after receiving the notification; a content comparator computing device comprising at least one processor and non-transient memory that stores program instructions which, when executed by the at least one processor, cause the at least one processor to: receive a request wirelessly transmitted from a second mobile computing device for a specific quantity of content to be provided from the celebrity content list; retrieve from the at least one database the copy of the celebrity content list; receive from the second mobile computing device a user content list identifying existing content stored on, or otherwise accessible by, the second mobile computing device; identify a first portion of content from the celebrity content list that is present in the user content list; identify a second portion of content from the celebrity content list that is not included in the user content list; and cause up to the specific quantity of content to be transmitted to the second mobile computing device only from the second portion and without transmitting the celebrity content list to the second mobile computing device. a first mobile computing device associated with a particular celebrity, the first mobile computing device having a celebrity content list stored therein, wherein when the particular celebrity uses the first mobile computing device to listen to or view specific digital content, the first mobile computing device will, in response to the particular celebrity viewing or listening to the specific digital content, automatically update the celebrity content list to add the viewed or listened to digital content; at least one database storing a copy of the celebrity content list, such that the first mobile computing device wirelessly transmits to the at least one database notification of the automatic update and the copy of the celebrity content list is automatically updated in the at least one database in response to a change in the celebrity content list after receiving the notification; a content comparator computing device comprising at least one processor and non-transient memory that stores program instructions which, when executed by the at least one processor, cause the at least one processor to: receive a request wirelessly transmitted from a second mobile computing device for a specific quantity of content to be provided from the celebrity content list; retrieve from the at least one database the copy of the celebrity content list; receive from the second mobile computing device a user content list identifying existing content stored on, or otherwise accessible by, the second mobile computing device; identify a first portion of content from the celebrity content list that is present in the user content list; identify a second portion of content from the celebrity content list that is not included in the user content list; and cause up to the specific quantity of content to be transmitted to the second mobile computing device only from the second portion and without transmitting the celebrity content list to the second mobile computing device. receive a request wirelessly transmitted from a second mobile computing device for a specific quantity of content to be provided from the celebrity content list; retrieve from the at least one database the copy of the celebrity content list; receive from the second mobile computing device a user content list identifying existing content stored on, or otherwise accessible by, the second mobile computing device; identify a first portion of content from the celebrity content list that is present in the user content list; identify a second portion of content from the celebrity content list that is not included in the user content list; and cause up to the specific quantity of content to be transmitted to the second mobile computing device only from the second portion and without transmitting the celebrity content list to the second mobile computing device.