Systems and methods for capturing media content in accordance with viewer expression are disclosed. In some implementations, a method is performed at a computer system having one or more processors and memory storing one or more programs for execution by the one or more processors. The method includes: (1) while a media content item is being presented to a user, capturing a momentary reaction of the user; (2) comparing the captured user reaction with one or more previously captured reactions of the user; (3) identifying the user reaction as one of a plurality of reaction types based on the comparison; (4) identifying the portion of the media content item corresponding to the momentary reaction; and (5) storing an association between the identified user reaction and the portion of the media content item.