Abstract: A computer system for managing presentation modification is configured to enable one or more users to request association of an author-created presentation with an account associated with the one or more users. In various embodiments, the system is configured to enable the author to make one or more modifications to the presentation. At least partially in response to modification by the presentation by the author, the system is configured to enable the one or more users to incorporate the one or more medications to the presentation associated with their account. In particular embodiments, the system is configured to store, in memory, each version of the presentation with various modifications and enable the one or more users to select any version of the presentation for presentation to at least one presentation viewer.