1. A system for facilitating presentation of supplemental content, the system comprising: one or more data stores configured to store: information regarding a base content; information regarding one or more items of supplemental content, wherein each item of supplemental content comprises a video content associated with at least one subject referenced by the base content; and content synchronization information that correlates positions within the base content with the one or more items of supplemental content; and one or more computer systems in communication with the one or more data stores, the one or more computer systems configured to: receive consumption information indicating a position of consumption of the base content; identify at least one item of supplemental content from the one or more items of supplemental content based at least in part on the received consumption information and the content synchronization information; and transmit the at least one item of supplemental content to a user device for presentation to a user.